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    Internet Engineering Task Force                                 G. Brown
    Internet-Draft                                      CentralNic Group plc
    Intended status: Standards Track                               J. Frakes
    Expires: October 10, 2016                                  April 8, 2016

     Registry Fee Extension for the Extensible Provisioning Protocol (EPP)
                            draft-brown-epp-fees-07

    Abstract

       This document describes an Extensible Provisioning Protocol (EPP)
       extension mapping for registry fees.

    Status of this Memo

       This Internet-Draft is submitted in full conformance with the
       provisions of BCP 78 and BCP 79.

       Internet-Drafts are working documents of the Internet Engineering
       Task Force (IETF).  Note that other groups may also distribute
       working documents as Internet-Drafts.  The list of current Internet-
       Drafts is at http://datatracker.ietf.org/drafts/current/.

       Internet-Drafts are draft documents valid for a maximum of six months
       and may be updated, replaced, or obsoleted by other documents at any
       time.  It is inappropriate to use Internet-Drafts as reference
       material or to cite them other than as "work in progress."

       This Internet-Draft will expire on October 10, 2016.

    Copyright Notice

       Copyright (c) 2016 IETF Trust and the persons identified as the
       document authors.  All rights reserved.

       This document is subject to BCP 78 and the IETF Trust's Legal
       Provisions Relating to IETF Documents
       (http://trustee.ietf.org/license-info) in effect on the date of
       publication of this document.  Please review these documents
       carefully, as they describe your rights and restrictions with respect
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       include Simplified BSD License text as described in Section 4.e of
       the Trust Legal Provisions and are provided without warranty as
       described in the Simplified BSD License.

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    Table of Contents

       1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
         1.1.  Conventions Used in This Document  . . . . . . . . . . . .  3
       2.  Migrating to Newer Versions of This Extension  . . . . . . . .  4
       3.  Extension Elements . . . . . . . . . . . . . . . . . . . . . .  4
         3.1.  Client Commands  . . . . . . . . . . . . . . . . . . . . .  4
         3.2.  Currency Codes . . . . . . . . . . . . . . . . . . . . . .  5
         3.3.  Validity Periods . . . . . . . . . . . . . . . . . . . . .  5
         3.4.  Fees and Credits . . . . . . . . . . . . . . . . . . . . .  5
           3.4.1.  Refunds  . . . . . . . . . . . . . . . . . . . . . . .  6
           3.4.2.  Grace Periods  . . . . . . . . . . . . . . . . . . . .  6
           3.4.3.  Correlation between Refundability and Grace Periods  .  7
           3.4.4.  Applicability  . . . . . . . . . . . . . . . . . . . .  7
         3.5.  Account Balance  . . . . . . . . . . . . . . . . . . . . .  7
         3.6.  Credit Limit . . . . . . . . . . . . . . . . . . . . . . .  7
         3.7.  Classification of Objects  . . . . . . . . . . . . . . . .  8
       4.  Server Handling of Fee Information . . . . . . . . . . . . . .  8
       5.  EPP Command Mapping  . . . . . . . . . . . . . . . . . . . . .  8
         5.1.  EPP Query Commands . . . . . . . . . . . . . . . . . . . .  9
           5.1.1.  EPP <check> Command  . . . . . . . . . . . . . . . . .  9
             5.1.1.1.  Server Handling of <fee:class> Elements  . . . . . 12
           5.1.2.  EPP Transfer Query Command . . . . . . . . . . . . . . 13
         5.2.  EPP Transform Commands . . . . . . . . . . . . . . . . . . 14
           5.2.1.  EPP <create> Command . . . . . . . . . . . . . . . . . 14
           5.2.2.  EPP <delete> Command . . . . . . . . . . . . . . . . . 17
           5.2.3.  EPP <renew> Command  . . . . . . . . . . . . . . . . . 18
           5.2.4.  EPP <transfer> Command . . . . . . . . . . . . . . . . 20
           5.2.5.  EPP <update> Command . . . . . . . . . . . . . . . . . 22
         5.3.  Formal Syntax  . . . . . . . . . . . . . . . . . . . . . . 24
       6.  Security Considerations  . . . . . . . . . . . . . . . . . . . 29
       7.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 30
         7.1.  XML Namespace  . . . . . . . . . . . . . . . . . . . . . . 30
         7.2.  EPP Extension Registry . . . . . . . . . . . . . . . . . . 30
       8.  Implementation Status  . . . . . . . . . . . . . . . . . . . . 30
         8.1.  RegistryEngine EPP Service . . . . . . . . . . . . . . . . 31
       9.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 31
       10. Change History . . . . . . . . . . . . . . . . . . . . . . . . 32
         10.1. Changes from 00 to 01  . . . . . . . . . . . . . . . . . . 32
         10.2. Changes from 01 to 02  . . . . . . . . . . . . . . . . . . 32
         10.3. Changes from 02 to 03  . . . . . . . . . . . . . . . . . . 33
         10.4. Changes from 03 to 04  . . . . . . . . . . . . . . . . . . 33
         10.5. Changes from 04 to 05  . . . . . . . . . . . . . . . . . . 34
         10.6. Changes from 05 to 06  . . . . . . . . . . . . . . . . . . 34
         10.7. Changes from 06 to 07  . . . . . . . . . . . . . . . . . . 35
       11. Normative References . . . . . . . . . . . . . . . . . . . . . 35
       Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 36

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    1.  Introduction

       Historically, domain name registries have applied a simple fee
       structure for billable transactions, namely a basic unit price
       applied to domain <create>, <renew>, <transfer> and RGP [RFC3915]
       restore commands.  Given the relatively small number of EPP servers
       to which EPP clients have been required to connect, it has generally
       been the case that client operators have been able to obtain details
       of these fees out-of-band by contacting the server operators.

       Given the recent expansion of the DNS namespace, and the
       proliferation of novel business models, it is now desirable to
       provide a method for EPP clients to query EPP servers for the fees
       and credits associated with certain commands and specific objects.

       This document describes an extension mapping for version 1.0 of the
       Extensible Provisioning Protocol (EPP) [RFC5730].  This EPP mapping
       provides a mechanism by which EPP clients may query the fees and
       credits associated with various billable transactions, and also
       obtain their current account balance.

    1.1.  Conventions Used in This Document

       The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
       "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
       document are to be interpreted as described in RFC 2119 [RFC2119].

       XML is case sensitive.  Unless stated otherwise, XML specifications
       and examples provided in this document MUST be interpreted in the
       character case presented in order to develop a conforming
       implementation.

       "fee" is used as an abbreviation for
       "urn:ietf:params:xml:ns:fee-0.11".  The XML namespace prefix "fee" is
       used, but implementations MUST NOT depend on it and instead employ a
       proper namespace-aware XML parser and serializer to interpret and
       output the XML documents.

       (Note to RFC Editor: remove the following paragraph before
       publication as an RFC.)

       The XML namespace prefix above contains a version number,
       specifically "0.11".  This version number will increment with
       successive versions of this document, and will reach 1.0 if and when
       this document is published as an RFC.  This permits clients to
       distinguish which version of the extension a server has implemented.

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    2.  Migrating to Newer Versions of This Extension

       (Note to RFC Editor: remove this section before publication as an
       RFC.)

       Servers which implement this extension SHOULD provide a way for
       clients to progressively update their implementations when a new
       version of the extension is deployed.

       Servers SHOULD (for a temporary migration period) provide support for
       older versions of the extension in parallel to the newest version,
       and allow clients to select their preferred version via the
       <svcExtension> element of the <login> command.

       If a client requests multiple versions of the extension at login,
       then, when preparing responses to commands which do not include
       extension elements, the server SHOULD only include extension elements
       in the namespace of the newest version of the extension requested by
       the client.

       When preparing responses to commands which do include extension
       elements, the server SHOULD only include extension elements for the
       extension versions present in the command.

    3.  Extension Elements

    3.1.  Client Commands

       The <fee:command> element is used in the EPP <check> command to
       determine the fee which is applicable to the given command.

       The element values permitted by the server is a matter of repository
       policy, but MUST include as a minimum the following values:

       o  "create" indicating a <create> command;

       o  "renew" indicating a <renew> command;

       o  "transfer" indicating a <transfer> command;

       If the server supports the Registry Grace Period Mapping [RFC3915],
       then the server MUST also support the "restore" value.

       The <fee:command> element MAY have an OPTIONAL "phase" attribute
       specifying a launch phase as described in
       [draft-ietf-eppext-launchphase].  It may also contain an OPTIONAL
       "subphase" attribute identifying the custom or sub-phase as described

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       in [draft-ietf-eppext-launchphase].

    3.2.  Currency Codes

       The <fee:currency> element is used to indicate which currency fees
       are charged in.  This value of this element MUST be a three-character
       currency code from [ISO4217].

       Note that ISO 4217 provides the special "XXX" code, which MAY be used
       if the server uses a non-currency based system for assessing fees,
       such as a system of credits.

       The use of <fee:currency> elements in commands is OPTIONAL: if a
       <fee:currency> element is not present in a command, the server MUST
       determine the currency based on the client's account settings which
       MUST be agreed by the client and server via an out-of-band channel.
       However, the <fee:currency> element MUST be present in responses.

       Servers SHOULD NOT perform a currency conversion if a client uses an
       incorrect currency code.  Servers SHOULD return a 2004 error instead.

    3.3.  Validity Periods

       When querying for fee information using the <check> command, the
       <fee:period> element is used to indicate the units to be added to the
       registration period of objects by the <create>, <renew> and
       <transfer> commands.  This element is derived from the <domain:
       period> element described in [RFC5731].

       The <fee:period> element is OPTIONAL in <check> commands: if omitted,
       the server MUST determine the fee(s) using a validity period of 1
       year.  The <fee:period> element MUST be present in <check> responses.

    3.4.  Fees and Credits

       Servers which implement this extension will include elements in
       responses which provide information about the fees and/or credits
       associated with a given billable transaction.

       The <fee:fee> and <fee:credit> elements are used to provide this
       information.  The presence of a <fee:fee> element in a response
       indicates a debit against the client's account balance; a <fee:
       credit> element indicates a credit.  A <fee:fee> element MUST have a
       non-negative value.  A <fee:credit> element MUST have a negative
       value.

       A server MAY respond with multiple <fee:fee> and <fee:credit>
       elements in the same response.  In such cases, the net fee or credit

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       applicable to the transaction is the arithmetic sum of the values of
       each of the <fee:fee> and/or <fee:credit> elements.  This amount
       applies to the total additional validity period applied to the object
       (where applicable) rather than to any incremental unit.

       The following attributes are defined for the <fee:fee> element.
       These are described in detail below:

       description:  an OPTIONAL attribute which provides a human-readable
          description of the fee.  Servers should provide documentation on
          the possible values of this attribute, and their meanings.

       refundable:  an OPTIONAL boolean attribute indicating whether the fee
          is refundable if the object is deleted.

       grace-period:  an OPTIONAL attribute which provides the time period
          during which the fee is refundable.

       applied:  an OPTIONAL attribute indicating when the fee will be
          deducted from the client's account.

       The <fee:credit> element can take a "description" attribute as
       described above.  No other attributes are defined for this element.

    3.4.1.  Refunds

       <fee:fee> elements MAY have an OPTIONAL "refundable" attribute which
       takes a boolean value.  Fees may be refunded under certain
       circumstances, such as when a domain application is rejected (as
       described in [draft-ietf-eppext-launchphase]) or when an object is
       deleted during the relevant Grace Period (see below).

       If the "refundable" attribute is omitted, then clients SHOULD NOT
       make any assumption about the refundability of the fee.

    3.4.2.  Grace Periods

       [RFC3915] describes a system of "grace periods", which are time
       periods following a billable transaction during which, if an object
       is deleted, the client receives a refund.

       The "grace-period" attribute MAY be used to indicate the relevant
       grace period for a fee.  If a server implements the Registry Grace
       Period extension, it MUST specify the grace period for all relevant
       transactions.

       If the "grace-period" attribute is omitted, then clients SHOULD NOT
       make any assumption about the grace period of the fee.

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    3.4.3.  Correlation between Refundability and Grace Periods

       If a <fee:fee> element has a "grace-period" attribute then it MUST
       also be refundable.  If the "refundable" attribute of a <fee:fee>
       element is false then it MUST NOT have a "grace-period" attribute.

    3.4.4.  Applicability

       Fees may be applied immediately upon receipt of a command from a
       client, or may only be applied once an out-of-band process (such as
       the processing of applications at the end of a launch phase) has
       taken place.

       The "applied" attribute of the <fee:fee> element allows servers to
       indicate whether a fee will be applied immediately, or whether it
       will be applied at some point in the future.  This attribute takes
       two possible values: "immediate" (which is the default) or "delayed".

    3.5.  Account Balance

       The <fee:balance> element is an OPTIONAL element which MAY be
       included in server responses to transform commands.  If present, it
       can be used by the client to determine the remaining credit at the
       server.

       Whether or not the <fee:balance> is included in responses is a matter
       of server policy.  However, if a server chooses to offer support for
       this element, it MUST be included in responses to all "transform"
       commands (ie <create>, <renew>, <update>, <delete>, <transfer
       op="request">).

       The value of the <fee:balance> MAY be negative.  A negative balance
       indicates that the server has extended a line of credit to the client
       (see below).

       If a server includes a <fee:balance> element in response to transform
       commands, the value of the element MUST reflect the client's account
       balance after any fees or credits associated with that command have
       been applied.

    3.6.  Credit Limit

       As described above, if a server returns a response containing a <fee:
       balance> with a negative value, then the server has extended a line
       of credit to the client.  A server MAY also include a <fee:
       creditLimit> element in responses which indicates the maximum credit
       available to a client.  A server MAY reject certain transactions if
       the absolute value of the <fee:balance> is equal to or exceeds the

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       value of the <fee:creditLimit> element.

       Whether or not the <fee:creditLimit> is included in responses is a
       matter of server policy.  However, if a server chooses to offer
       support for this element, it MUST be included in responses to all
       "transform" commands (ie <create>, <renew>, <update>, <delete>,
       <transfer op="request">).

    3.7.  Classification of Objects

       Objects may be assigned to a particular class, category, or tier,
       each of which has a particular fee or set of fees associated with it.
       The <fee:class> element which appears in <check> responses is used to
       indicate the classification of an object.

       If a server makes use of this element, it should provide clients with
       a list of all the values that the element may take via an out-of-band
       channel.  Servers MUST NOT use values which do not appear on this
       list.

       Servers which make use of this element MUST use a <fee:class> element
       with the value "standard" for all objects that are subject to the
       standard or default fee.

    4.  Server Handling of Fee Information

       Depending on server policy, a client MAY be required to include the
       extension elements described in this document for certain transform
       commands.  Servers must provide clear documentation to clients about
       the circumstances in which this extension must be used.

       If a server receives a command from a client which does not include
       the extension elements required by the server for that command, then
       it MUST respond with a 2003 "Required parameter missing" error.

       If the currency or total fee provided by the client do not agree with
       the server's own calculation of the fee for that command, then the
       server MUST reject the command with a 2004 "Parameter value range"
       error.

    5.  EPP Command Mapping

       A detailed description of the EPP syntax and semantics can be found
       in [RFC5730].

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    5.1.  EPP Query Commands

       This extension does not add any elements to the EPP <poll> or <info>
       commands or responses.

    5.1.1.  EPP <check> Command

       This extension defines additional elements for the EPP <check>
       command.

       The command MAY contain an <extension> element which MAY contain a
       <fee:check> element.  The <fee:check> element contains the following
       child elements:

       o  A <fee:command> element;

       o  An OPTIONAL <fee:currency> element;

       o  An OPTIONAL <fee:period> element.

       o  An OPTIONAL <fee:class> element.

       Example <check> command:

       C: <?xml version="1.0" encoding="utf-8" standalone="no"?>
       C: <epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
       C:   <command>
       C:     <check>
       C:       <domain:check
       C:         xmlns:domain="urn:ietf:params:xml:ns:domain-1.0">
       C:         <domain:name>example.com</domain:name>
       C:         <domain:name>example.net</domain:name>
       C:         <domain:name>example.xyz</domain:name>
       C:       </domain:check>
       C:     </check>
       C:     <extension>
       C:       <fee:check xmlns:fee="urn:ietf:params:xml:ns:fee-0.11">
       C:         <fee:command>create</fee:command>
       C:         <fee:currency>USD</fee:currency>
       C:       </fee:check>
       C:     </extension>
       C:     <clTRID>ABC-12345</clTRID>
       C:   </command>
       C: </epp>

       When the server receives a <check> command that includes the
       extension elements described above, its response MUST (subject to the
       exception described below) contain an <extension> element, which MUST

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       contain a child <fee:chkData> element.  The <fee:chkData> element
       MUST contain a <fee:cd> element for each object referenced in the
       <check> element in the command.

       The <fee:cd> element has an OPTIONAL "avail" atribute which is a
       boolean.  If the value of this attribute evalutes to false, this
       indicates that the server cannot calculate the relevant fees, because
       the object, command, currency, period or class is invalid according
       to server policy.

       The <fee:cd> contains the following child elements:

       o  A <fee:object> element, which contains a copy of the child element
          of the <check> element of the command, to which the fee
          information relates.

       o  A <fee:command> element, which contains the same command that
          appeared in the corresponding <fee:object> element.  This element
          MAY have the OPTIONAL "phase" and "subphase" elements, which MUST
          match the same attributes in the corresponding <fee:object>
          element.

       o  A <fee:currency> element, which contains the same currency code
          that appeared in the <fee:currency> element of the command.  If no
          <fee:currency> element appeared in the command, then the client's
          default billing currency should be used.

       o  An OPTIONAL <fee:period> element, which contains the same unit
          that appeared in the <fee:currency> element of the command.  If
          the value of the preceding <fee:command> element is "restore",
          this element MUST NOT be included.  Otherwise it MUST be included.
          If no <fee:period> appeared in command (and the command is not
          "restore") then this element MUST have a value of 1 year.

       o  Zero or more <fee:fee> elements.

       o  Zero or more <fee:credit> elements.

       o  An OPTIONAL <fee:class> element.

       o  An OPTIONAL <fee:reason> element.

       If no <fee:fee> elements are present in a <fee:cd> element, this
       indicates that no fee will be assessed by the server for this
       command.

       If the "avail" attribute of the <fee:cd> element is false, then the
       <fee:cd> element MUST NOT contain any <fee:fee> or <fee:credit> child

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       elements.  If the "avail" attribute is true, then the <fee:cd>
       element MUST NOT contain a <fee:reason> element.

       Example <check> response:

       S: <?xml version="1.0" encoding="utf-8" standalone="no"?>
       S: <epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
       S:   <response>
       S:     <result code="1000">
       S:       <msg>Command completed successfully</msg>
       S:     </result>
       S:     <resData>
       S:       <domain:chkData
       S:         xmlns:domain="urn:ietf:params:xml:ns:domain-1.0">
       S:         <domain:cd>
       S:           <domain:name avail="1">example.com</domain:name>
       S:         </domain:cd>
       S:         <domain:cd>
       S:           <domain:name avail="1">example.net</domain:name>
       S:         </domain:cd>
       S:         <domain:cd>
       S:           <domain:name avail="1">example.xyz</domain:name>
       S:         </domain:cd>
       S:       </domain:chkData>
       S:     </resData>
       S:     <extension>
       S:       <fee:chkData
       S:           xmlns:fee="urn:ietf:params:xml:ns:fee-0.11"
       S:           xmlns:domain="urn:ietf:params:xml:ns:domain-1.0">
       S:         <fee:cd avail="1">
       S:           <fee:object>
       S:             <domain:name>example.com</domain:name>
       S:           </fee:object>
       S:           <fee:command>create</fee:command>
       S:           <fee:currency>USD</fee:currency>
       S:           <fee:period unit="y">1</fee:period>
       S:           <fee:fee
       S:             description="Registration Fee"
       S:             refundable="1"
       S:             grace-period="P5D">5.00</fee:fee>
       S:         </fee:cd>
       S:         <fee:cd avail="1">
       S:           <fee:object>
       S:             <domain:name>example.com</domain:name>
       S:           </fee:object>
       S:           <fee:command>create</fee:command>
       S:           <fee:currency>USD</fee:currency>
       S:           <fee:period unit="y">1</fee:period>

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       S:           <fee:fee
       S:             description="Registration Fee"
       S:             refundable="1"
       S:             grace-period="P5D">5.00</fee:fee>
       S:         </fee:cd>
       S:         <fee:cd avail="0">
       S:           <fee:object>
       S:             <domain:name>example.com</domain:name>
       S:           </fee:object>
       S:           <fee:command>create</fee:command>
       S:           <fee:currency>USD</fee:currency>
       S:           <fee:period unit="y">1</fee:period>
       S:           <fee:reason>
       S:             minimum period is 2 years.
       S:           </fee:reason>
       S:         </fee:cd>
       S:       </fee:chkData>
       S:     </extension>
       S:     <trID>
       S:       <clTRID>ABC-12345</clTRID>
       S:       <svTRID>54322-XYZ</svTRID>
       S:     </trID>
       S:   </response>
       S: </epp>

    5.1.1.1.  Server Handling of <fee:class> Elements

       Clients MAY include a <fee:class> in the <fee:check> element.  There
       are three ways in which servers may handle this element:

       1.  If the server supports the concept of tiers or classes of
           objects, then the value of this element MUST be validated.  If
           incorrect for the specified object, the "avail" attribute of the
           corresponding <fee:cd> element MUST be false.

       2.  If the server supports different "types" of object registrations
           (such as a "blocking" registration which does not resolve, or
           where a registry provides a value-added service that requires an
           opt-out to disable), then, as with the first model, the server
           MUST valudate the value of the element.  If the value is
           incorrect, the "avail" attribute of the corresponding <fee:cd>
           element MUST be false.

       3.  If the server supports neither of the above models, the element
           MUST be ignored.

       Server operators must provide clear documentation to client operators
       which of the above models it supports.

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    5.1.2.  EPP Transfer Query Command

       This extension does not add any elements to the EPP <transfer> query
       command, but does include elements in the response, when the
       extension has been selected during a <login> command.

       When the <transfer> query command has been processed successfully,
       the client selected the extension when it logged in, and the client
       is authorised by the server to view information about the transfer,
       the server MAY include in the <extension> section of the EPP response
       a <fee:trnData> element, which contains the following child elements:

       o  A <fee:currency> element.

       o  A <fee:period> element.

       o  Zero or more <fee:fee> elements containing the fees that will be
          charged to the gaining client.

       o  Zero or more <fee:credit> elements containing the credits that
          will be refunded to the losing client.

       Servers SHOULD omit <fee:credit> when returning a response to the
       gaining client, and omit <fee:fee> elements when returning a response
       to the losing client.

       If no <fee:trnData> element is included in the response, then no fee
       will be assessed by the server for the transfer.

       Example <transfer> query response:

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       S: <?xml version="1.0" encoding="utf-8" standalone="no"?>
       S: <epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
       S:   <response>
       S:     <result code="1001">
       S:       <msg>Command completed successfully; action pending</msg>
       S:     </result>
       S:     <resData>
       S:       <domain:trnData
       S:         xmlns:domain="urn:ietf:params:xml:ns:domain-1.0">
       S:         <domain:name>example.com</domain:name>
       S:         <domain:trStatus>pending</domain:trStatus>
       S:         <domain:reID>ClientX</domain:reID>
       S:         <domain:reDate>2000-06-08T22:00:00.0Z</domain:reDate>
       S:         <domain:acID>ClientY</domain:acID>
       S:         <domain:acDate>2000-06-13T22:00:00.0Z</domain:acDate>
       S:         <domain:exDate>2002-09-08T22:00:00.0Z</domain:exDate>
       S:       </domain:trnData>
       S:     </resData>
       S:     <extension>
       S:       <fee:trnData xmlns:fee="urn:ietf:params:xml:ns:fee-0.11">
       S:         <fee:currency>USD</fee:currency>
       S:         <fee:period unit="y">1</fee:period>
       S:         <fee:fee>5.00</fee:fee>
       S:       </fee:trnData>
       S:     </extension>
       S:     <trID>
       S:       <clTRID>ABC-12345</clTRID>
       S:       <svTRID>54322-XYZ</svTRID>
       S:     </trID>
       S:   </response>
       S: </epp>

    5.2.  EPP Transform Commands

    5.2.1.  EPP <create> Command

       This extension adds elements to both the EPP <create> command and
       response, when the extension has been selected during a <login>
       command.

       When submitting a <create> command to the server, the client MAY
       include in the <extension> element a <fee:create> element which
       includes the following child elements:

       o  An OPTIONAL <fee:currency> element;

       o  One or more <fee:fee> elements.

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       When the <create> command has been processed successfully, and the
       client selected the extension when it logged in, and a fee was
       assessed by the server for the transaction, the server MUST include
       in the <extension> section of the EPP response a <fee:creData>
       element, which contains the following child elements:

       o  A <fee:currency> element;

       o  Zero or more <fee:fee> elements;

       o  Zero or more <fee:credit> elements;

       o  An OPTIONAL <fee:balance> element;

       o  An OPTIONAL <fee:creditLimit> element.

       If no fee or credit has been assessed by the server for this
       transaction, a <fee:creData> element MUST NOT be included in the
       response.

       Example <create> command:

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       C: <?xml version="1.0" encoding="utf-8" standalone="no"?>
       C: <epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
       C:   <command>
       C:     <create>
       C:       <domain:create
       C:         xmlns:domain="urn:ietf:params:xml:ns:domain-1.0">
       C:         <domain:name>example.com</domain:name>
       C:         <domain:period unit="y">2</domain:period>
       C:         <domain:ns>
       C:           <domain:hostObj>ns1.example.net</domain:hostObj>
       C:           <domain:hostObj>ns2.example.net</domain:hostObj>
       C:         </domain:ns>
       C:         <domain:registrant>jd1234</domain:registrant>
       C:         <domain:contact type="admin">sh8013</domain:contact>
       C:         <domain:contact type="tech">sh8013</domain:contact>
       C:         <domain:authInfo>
       C:           <domain:pw>2fooBAR</domain:pw>
       C:         </domain:authInfo>
       C:       </domain:create>
       C:     </create>
       C:     <extension>
       C:       <fee:create xmlns:fee="urn:ietf:params:xml:ns:fee-0.11">
       C:         <fee:currency>USD</fee:currency>
       C:         <fee:fee>5.00</fee:fee>
       C:       </fee:create>
       C:     </extension>
       C:     <clTRID>ABC-12345</clTRID>
       C:   </command>
       C: </epp>

       Example <create> response:

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       S: <?xml version="1.0" encoding="utf-8" standalone="no"?>
       S: <epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
       S:   <response>
       S:     <result code="1000">
       S:       <msg>Command completed successfully</msg>
       S:     </result>
       S:     <resData>
       S:       <domain:creData
       S:         xmlns:domain="urn:ietf:params:xml:ns:domain-1.0">
       S:         <domain:name>example.com</domain:name>
       S:         <domain:crDate>1999-04-03T22:00:00.0Z</domain:crDate>
       S:         <domain:exDate>2001-04-03T22:00:00.0Z</domain:exDate>
       S:       </domain:creData>
       S:     </resData>
       S:     <extension>
       S:       <fee:creData xmlns:fee="urn:ietf:params:xml:ns:fee-0.11">
       S:         <fee:currency>USD</fee:currency>
       S:         <fee:fee grace-period="P5D">5.00</fee:fee>
       S:         <fee:balance>-5.00</fee:balance>
       S:         <fee:creditLimit>1000.00</fee:creditLimit>
       S:       </fee:creData>
       S:     </extension>
       S:     <trID>
       S:       <clTRID>ABC-12345</clTRID>
       S:       <svTRID>54321-XYZ</svTRID>
       S:     </trID>
       S:   </response>
       S: </epp>

    5.2.2.  EPP <delete> Command

       This extension does not add any elements to the EPP <delete> command,
       but does include elements in the response, when the extension has
       been selected during the <login> command.

       When the <delete> command has been processed successfully, and the
       client selected the extension when it logged in, the server MAY
       include in the <extension> section of the EPP response a <fee:
       delData> element, which contains the following child elements:

       o  A <fee:currency> element;

       o  Zero or more <fee:credit> elements;

       o  An OPTIONAL <fee:balance> element;

       o  An OPTIONAL <fee:creditLimit> element.

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       If no credit has been assessed by the server for this transaction, a
       <fee:delData> element MUST NOT be included in the response.

       Example <delete> response:

       S: <?xml version="1.0" encoding="utf-8" standalone="no"?>
       S: <epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
       S:   <response>
       S:     <result code="1000">
       S:       <msg>Command completed successfully</msg>
       S:     </result>
       S:     <extension>
       S:       <fee:delData
       S:         xmlns:fee="urn:ietf:params:xml:ns:fee-0.11">
       S:         <fee:currency>USD</fee:currency>
       S:         <fee:credit description="AGP Credit">-5.00</fee:credit>
       S:         <fee:balance>1005.00</fee:balance>
       S:       </fee:delData>
       S:     </extension>
       S:     <trID>
       S:       <clTRID>ABC-12345</clTRID>
       S:       <svTRID>54321-XYZ</svTRID>
       S:     </trID>
       S:   </response>
       S: </epp>

    5.2.3.  EPP <renew> Command

       This extension adds elements to both the EPP <renew> command and
       response, when the extension has been selected during a <login>
       command.

       When submitting a <renew> command to the server, the client MAY
       include in the <extension> element a <fee:renew> element which
       includes the following child elements:

       o  An OPTIONAL <fee:currency> element;

       o  One or more <fee:fee> elements.

       When the <renew> command has been processed successfully, and the
       client selected the extension when it logged in, the server MAY
       include in the <extension> section of the EPP response a <fee:
       renData> element, which contains the following child elements:

       o  A <fee:currency> element;

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       o  Zero or more <fee:fee> elements;

       o  Zero or more <fee:credit> elements;

       o  An OPTIONAL <fee:balance> element;

       o  An OPTIONAL <fee:creditLimit> element.

       If no fee or credit has been assessed by the server for this
       transaction, a <fee:renData> element MUST NOT be included in the
       response.

       Example <renew> command:

       C: <?xml version="1.0" encoding="utf-8" standalone="no"?>
       C: <epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
       C:   <command>
       C:     <renew>
       C:       <domain:renew
       C:         xmlns:domain="urn:ietf:params:xml:ns:domain-1.0">
       C:         <domain:name>example.com</domain:name>
       C:         <domain:curExpDate>2000-04-03</domain:curExpDate>
       C:         <domain:period unit="y">5</domain:period>
       C:       </domain:renew>
       C:     </renew>
       C:     <extension>
       C:       <fee:renew xmlns:fee="urn:ietf:params:xml:ns:fee-0.11">
       C:         <fee:currency>USD</fee:currency>
       C:         <fee:fee>5.00</fee:fee>
       C:       </fee:renew>
       C:     </extension>
       C:     <clTRID>ABC-12345</clTRID>
       C:   </command>
       C: </epp>

       Example <renew> response:

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       S: <?xml version="1.0" encoding="utf-8" standalone="no"?>
       S: <epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
       S:   <response>
       S:     <result code="1000">
       S:       <msg>Command completed successfully</msg>
       S:     </result>
       S:     <resData>
       S:       <domain:renData
       S:         xmlns:domain="urn:ietf:params:xml:ns:domain-1.0">
       S:         <domain:name>example.com</domain:name>
       S:         <domain:exDate>2005-04-03T22:00:00.0Z</domain:exDate>
       S:       </domain:renData>
       S:     </resData>
       S:     <extension>
       S:       <fee:renData xmlns:fee="urn:ietf:params:xml:ns:fee-0.11">
       S:         <fee:currency>USD</fee:currency>
       S:         <fee:fee grace-period="P5D">5.00</fee:fee>
       S:         <fee:balance>1000.00</fee:balance>
       S:       </fee:renData>
       S:     </extension>
       S:     <trID>
       S:       <clTRID>ABC-12345</clTRID>
       S:       <svTRID>54322-XYZ</svTRID>
       S:     </trID>
       S:   </response>
       S: </epp>

    5.2.4.  EPP <transfer> Command

       This extension adds elements to both the EPP <transfer> command and
       response, when the value of the "op" attribute of the <transfer>
       command element is "request", and the extension has been selected
       during the <login> command.

       When submitting a <transfer> command to the server, the client MAY
       include in the <extension> element a <fee:transfer> element which
       includes the following child elements:

       o  An OPTIONAL <fee:currency> element;

       o  One or more <fee:fee> elements.

       When the <transfer> command has been processed successfully, and the
       client selected the extension when it logged in, the server MAY
       include in the <extension> section of the EPP response a <fee:
       trnData> element, which contains the following child elements:

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       o  A <fee:currency> element;

       o  Zero or more <fee:fee> elements;

       o  Zero or more <fee:credit> elements;

       o  An OPTIONAL <fee:balance> element;

       o  An OPTIONAL <fee:creditLimit> element.

       If no fee or credit has been assessed by the server for this
       transaction, a <fee:trnData> element MUST NOT be included in the
       response.

       Example <transfer> command:

       C: <?xml version="1.0" encoding="utf-8" standalone="no"?>
       C: <epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
       C:   <command>
       C:     <transfer op="request">
       C:       <domain:transfer
       C:         xmlns:domain="urn:ietf:params:xml:ns:domain-1.0">
       C:         <domain:name>example.com</domain:name>
       C:         <domain:period unit="y">1</domain:period>
       C:         <domain:authInfo>
       C:           <domain:pw roid="JD1234-REP">2fooBAR</domain:pw>
       C:         </domain:authInfo>
       C:       </domain:transfer>
       C:     </transfer>
       C:     <extension>
       C:       <fee:transfer xmlns:fee="urn:ietf:params:xml:ns:fee-0.11">
       C:         <fee:currency>USD</fee:currency>
       C:         <fee:fee>5.00</fee:fee>
       C:       </fee:transfer>
       C:     </extension>
       C:     <clTRID>ABC-12345</clTRID>
       C:   </command>
       C: </epp>

       Example <transfer> response:

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       S: <?xml version="1.0" encoding="utf-8" standalone="no"?>
       S: <epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
       S:   <response>
       S:     <result code="1001">
       S:       <msg>Command completed successfully; action pending</msg>
       S:     </result>
       S:     <resData>
       S:       <domain:trnData
       S:         xmlns:domain="urn:ietf:params:xml:ns:domain-1.0">
       S:         <domain:name>example.com</domain:name>
       S:         <domain:trStatus>pending</domain:trStatus>
       S:         <domain:reID>ClientX</domain:reID>
       S:         <domain:reDate>2000-06-08T22:00:00.0Z</domain:reDate>
       S:         <domain:acID>ClientY</domain:acID>
       S:         <domain:acDate>2000-06-13T22:00:00.0Z</domain:acDate>
       S:         <domain:exDate>2002-09-08T22:00:00.0Z</domain:exDate>
       S:       </domain:trnData>
       S:     </resData>
       S:     <extension>
       S:       <fee:trnData xmlns:fee="urn:ietf:params:xml:ns:fee-0.11">
       S:         <fee:currency>USD</fee:currency>
       S:         <fee:fee grace-period="P5D">5.00</fee:fee>
       S:       </fee:trnData>
       S:     </extension>
       S:     <trID>
       S:       <clTRID>ABC-12345</clTRID>
       S:       <svTRID>54322-XYZ</svTRID>
       S:     </trID>
       S:   </response>
       S: </epp>

    5.2.5.  EPP <update> Command

       This extension adds elements to both the EPP <update> command and
       response, when the extension has been selected during a <login> has
       been selected during the <login> command.

       When submitting a <update> command to the server, the client MAY
       include in the <extension> element a <fee:update> element which
       includes the following child elements:

       o  An OPTIONAL <fee:currency> element;

       o  One or more <fee:fee> elements.

       When the <update> command has been processed successfully, and the
       client selected the extension when it logged in, the server MAY
       include in the <extension> section of the EPP response a <fee:upData>

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       element, which contains the following child elements:

       o  A <fee:currency> element;

       o  Zero or more <fee:fee> elements;

       o  Zero or more <fee:credit> elements;

       o  An OPTIONAL <fee:balance> element;

       o  An OPTIONAL <fee:creditLimit> element.

       If no fee or credit has been assessed by the server for this
       transaction, a <fee:upData> element MUST NOT be included in the
       response.

       Example <update> command:

       C: <?xml version="1.0" encoding="utf-8" standalone="no"?>
       C: <epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
       C:   <command>
       C:     <update>
       C:       <domain:update
       C:         xmlns:domain="urn:ietf:params:xml:ns:domain-1.0">
       C:         <domain:name>example.com</domain:name>
       C:         <domain:chg>
       C:           <domain:registrant>sh8013</domain:registrant>
       C:         </domain:chg>
       C:       </domain:update>
       C:     </update>
       C:     <extension>
       C:       <fee:update xmlns:fee="urn:ietf:params:xml:ns:fee-0.11">
       C:         <fee:currency>USD</fee:currency>
       C:         <fee:fee>5.00</fee:fee>
       C:       </fee:update>
       C:     </extension>
       C:     <clTRID>ABC-12345</clTRID>
       C:   </command>
       C: </epp>

       Example <update> response:

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       S: <?xml version="1.0" encoding="utf-8" standalone="no"?>
       S: <epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
       S:   <response>
       S:     <result code="1000">
       S:       <msg>Command completed successfully</msg>
       S:     </result>
       S:     <extension>
       S:       <fee:updData xmlns:fee="urn:ietf:params:xml:ns:fee-0.11">
       S:         <fee:currency>USD</fee:currency>
       S:         <fee:fee>5.00</fee:fee>
       S:       </fee:updData>
       S:     </extension>
       S:     <trID>
       S:       <clTRID>ABC-12345</clTRID>
       S:       <svTRID>54321-XYZ</svTRID>
       S:     </trID>
       S:   </response>
       S: </epp>

    5.3.  Formal Syntax

       An EPP object mapping is specified in XML Schema notation.  The
       formal syntax presented here is a complete schema representation of
       the object mapping suitable for automated validation of EPP XML
       instances.

       Copyright (c) 2014 IETF Trust and the persons identified as authors
       of the code.  All rights reserved.

       Redistribution and use in source and binary forms, with or without
       modification, are permitted provided that the following conditions
       are met:

       o  Redistributions of source code must retain the above copyright
          notice, this list of conditions and the following disclaimer.

       o  Redistributions in binary form must reproduce the above copyright
          notice, this list of conditions and the following disclaimer in
          the documentation and/or other materials provided with the
          distribution.

       o  Neither the name of Internet Society, IETF or IETF Trust, nor the
          names of specific contributors, may be used to endorse or promote
          products derived from this software without specific prior written
          permission.

       THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
       "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

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       LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
       A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT
       OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
       SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
       LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
       DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
       THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
       (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
       OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

       BEGIN
       <?xml version="1.0" encoding="utf-8"?>
       <schema xmlns="http://www.w3.org/2001/XMLSchema"
         xmlns:fee="urn:ietf:params:xml:ns:fee-0.11"
         xmlns:eppcom="urn:ietf:params:xml:ns:eppcom-1.0"
         xmlns:domain="urn:ietf:params:xml:ns:domain-1.0"
         targetNamespace="urn:ietf:params:xml:ns:fee-0.11"
         elementFormDefault="qualified">

         <import namespace="urn:ietf:params:xml:ns:eppcom-1.0" />
         <import namespace="urn:ietf:params:xml:ns:domain-1.0" />

         <annotation>
           <documentation>Extensible Provisioning Protocol
           v1.0 extension schema for fee
           information.</documentation>
         </annotation>

         <!--
         Child elements found in EPP commands and responses
         -->
         <element name="check" type="fee:checkType" />
         <element name="chkData" type="fee:chkDataType" />
         <element name="create" type="fee:transformCommandType" />
         <element name="creData" type="fee:transformResultType" />
         <element name="renew" type="fee:transformCommandType" />
         <element name="renData" type="fee:transformResultType" />
         <element name="transfer" type="fee:transformCommandType" />
         <element name="trnData" type="fee:transferResultType" />
         <element name="update" type="fee:transformCommandType" />
         <element name="updData" type="fee:transformResultType" />
         <element name="delData" type="fee:deleteDataType" />

         <!--
         client <check> command
         -->
         <complexType name="checkType">
           <sequence>

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             <element name="command" type="fee:commandType" />
             <element name="currency" type="fee:currencyType"
               minOccurs="0" />
             <element name="period" type="domain:periodType"
               minOccurs="0" />
             <element name="class" type="token"
               minOccurs="0" />
           </sequence>
         </complexType>

         <!--
         server <check> result
         -->
         <complexType name="chkDataType">
           <sequence>
             <element name="cd" type="fee:objectCDType"
               maxOccurs="unbounded" />
           </sequence>
         </complexType>

         <complexType name="objectCDType">
           <sequence>
             <element name="object">
               <complexType>
                 <sequence>
                   <any namespace="##other" processContents="lax"/>
                 </sequence>
               </complexType>
             </element>
             <element name="command" type="fee:commandType" />
             <element name="currency" type="fee:currencyType" />
             <element name="period" type="domain:periodType"
               minOccurs="0" maxOccurs="1" />
             <element name="fee" type="fee:feeType"
                minOccurs="0" maxOccurs="unbounded" />
             <element name="credit" type="fee:creditType"
                minOccurs="0" maxOccurs="unbounded" />
              <element name="class" type="token" minOccurs="0" />
              <element name="reason" type="token" minOccurs="0" />
           </sequence>
           <attribute name="avail" type="boolean" default="1" />
         </complexType>

         <!--
           general transform (create, renew, update, transfer) command
         -->
         <complexType name="transformCommandType">
           <sequence>

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             <element name="currency" type="fee:currencyType"
               minOccurs="0" />
             <element name="fee" type="fee:feeType"
               maxOccurs="unbounded" />
             <element name="credit" type="fee:creditType"
               minOccurs="0" maxOccurs="unbounded" />
           </sequence>
         </complexType>

         <!--
           general transform (create, renew, update) result
         -->
         <complexType name="transformResultType">
           <sequence>
             <element name="currency" type="fee:currencyType" />
             <element name="fee" type="fee:feeType"
               minOccurs="0" maxOccurs="unbounded" />
             <element name="credit" type="fee:creditType"
               minOccurs="0" maxOccurs="unbounded" />
             <element name="balance" type="fee:balanceType"
               minOccurs="0" />
             <element name="creditLimit" type="fee:creditLimitType"
               minOccurs="0" />
           </sequence>
         </complexType>

         <!--
           transfer result
         -->
         <complexType name="transferResultType">
           <sequence>
             <element name="currency" type="fee:currencyType" />

             <!-- only used op="query" responses -->
             <element name="period" type="domain:periodType"
               minOccurs="0" />

             <element name="fee" type="fee:feeType"
               maxOccurs="unbounded" />
             <element name="credit" type="fee:creditType"
               minOccurs="0" maxOccurs="unbounded" />
           </sequence>
         </complexType>

         <!--
           delete result
         -->
         <complexType name="deleteDataType">

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           <sequence>
             <element name="currency" type="fee:currencyType" />
             <element name="credit" type="fee:creditType"
               minOccurs="0" maxOccurs="unbounded" />
             <element name="balance" type="fee:balanceType"
               minOccurs="0" />
             <element name="creditLimit" type="fee:creditLimitType"
               minOccurs="0" />
           </sequence>
         </complexType>

         <!--
           common types
         -->
         <simpleType name="currencyType">
           <restriction base="string">
             <pattern value="[A-Z]{3}" />
           </restriction>
         </simpleType>

         <complexType name="commandType">
           <simpleContent>
             <extension base="fee:commandTypeValue">
               <attribute name="phase" type="token" />
               <attribute name="subphase" type="token" />
             </extension>
           </simpleContent>
         </complexType>

         <simpleType name="commandTypeValue">
           <restriction base="token">
             <minLength value="3"/>
             <maxLength value="16"/>
           </restriction>
         </simpleType>

         <simpleType name="nonNegativeDecimal">
           <restriction base="decimal">
             <minInclusive value="0" />
           </restriction>
         </simpleType>

         <simpleType name="negativeDecimal">
           <restriction base="decimal">
             <maxInclusive value="0" />
           </restriction>
         </simpleType>

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         <complexType name="feeType">
           <simpleContent>
             <extension base="fee:nonNegativeDecimal">
               <attribute name="description"/>
               <attribute name="refundable" type="boolean" />
               <attribute name="grace-period" type="duration" />
               <attribute name="applied" default="immediate">
                 <simpleType>
                   <restriction base="token">
                     <enumeration value="immediate" />
                     <enumeration value="delayed" />
                   </restriction>
                 </simpleType>
               </attribute>
             </extension>
           </simpleContent>
         </complexType>

         <complexType name="creditType">
           <simpleContent>
             <extension base="fee:negativeDecimal">
               <attribute name="description"/>
             </extension>
           </simpleContent>
         </complexType>

         <simpleType name="balanceType">
           <restriction base="decimal" />
         </simpleType>

         <simpleType name="creditLimitType">
           <restriction base="decimal" />
         </simpleType>

       </schema>

       END

    6.  Security Considerations

       The mapping extensions described in this document do not provide any
       security services beyond those described by EPP [RFC5730], the EPP
       domain name mapping [RFC5731], and protocol layers used by EPP.  The
       security considerations described in these other specifications apply
       to this specification as well.

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    7.  IANA Considerations

    7.1.  XML Namespace

       This document uses URNs to describe XML namespaces and XML schemas
       conforming to a registry mechanism described in [RFC3688].  The
       following URI assignment is requested of IANA:

       URI: urn:ietf:params:xml:ns:fee-0.11

       Registrant Contact: See the "Author's Address" section of this
       document.

       XML: See the "Formal Syntax" section of this document.

    7.2.  EPP Extension Registry

       The EPP extension described in this document should be registered by
       the IANA in the EPP Extension Registry described in [RFC7451].  The
       details of the registration are as follows:

       Name of Extension: EPP Fee Extension

       Document status: Standards Track

       Reference: (insert reference to RFC version of this document)

       Registrant Name and Email Address: See the "Author's Address" section
       of this document.

       TLDs: any

       IPR Disclosure: none

       Status: active

       Notes: none

    8.  Implementation Status

       Note to RFC Editor: Please remove this section and the reference to
       [RFC6982] before publication.

       This section records the status of known implementations of the
       protocol defined by this specification at the time of posting of this
       Internet-Draft, and is based on a proposal described in [RFC6982].
       The description of implementations in this section is intended to

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       assist the IETF in its decision processes in progressing drafts to
       RFCs.  Please note that the listing of any individual implementation
       here does not imply endorsement by the IETF.  Furthermore, no effort
       has been spent to verify the information presented here that was
       supplied by IETF contributors.  This is not intended as, and must not
       be construed to be, a catalog of available implementations or their
       features.  Readers are advised to note that other implementations may
       exist.

       According to [RFC6982], "this will allow reviewers and working groups
       to assign due consideration to documents that have the benefit of
       running code, which may serve as evidence of valuable experimentation
       and feedback that have made the implemented protocols more mature.
       It is up to the individual working groups to use this information as
       they see fit".

    8.1.  RegistryEngine EPP Service

       Organization: CentralNic

       Name: RegistryEngine EPP Service

       Description: Generic high-volume EPP service for gTLDs, ccTLDs and
       SLDs

       Level of maturity: Deployed in CentralNic's production environment as
       well as two other gTLD registry systems, and two ccTLD registry
       systems.

       Coverage: All aspects of the protocol are implemented.

       Licensing: Proprietary In-House software

       Contact: epp@centralnic.com

       URL: https://www.centralnic.com

    9.  Acknowledgements

       The authors wish to thank the following persons for their feedback
       and suggestions:

       o  James Gould of Verisign

       o  Luis Munoz of ISC

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       o  Michael Young of Architelos

       o  Ben Levac and Jeff Eckhaus of Demand Media

       o  Seth Goldman of Google

       o  Klaus Malorny and Michael Bauland of Knipp

       o  Jody Kolker and Roger Carney of Go Daddy

       o  Michael Holloway of Com Laude

       o  Santosh Kalsangrah of Impetus Infotech

       o  Alex Mayrhofer of Nic.at

    10.  Change History

    10.1.  Changes from 00 to 01

       1.  Restore the <check> command extension; either <check> or <info>
           can be used.

       2.  added extension elements for <create>, <renew>, <transfer> and
           <update> so that the server can reject the command if the fee is
           incorrect.

    10.2.  Changes from 01 to 02

       1.   Use Internet-Draft version number rather than XML namespace
            version number in this section.

       2.   Support for multiple <fee:fee> and <fee:credit> elements.

       3.   Added the "description" attribute to <fee:fee> and <fee:credit>
            elements.

       4.   Added the <fee:balance> element.

       5.   Added the <fee:creditLimit> element.

       6.   Updated reference to [draft-ietf-eppext-launchphase].

       7.   Use <fee:command> instead of <fee:action>.

       8.   Use a single child element of <fee:chkData> instead of multiple
            elements for each domain.  This also requires using a different

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            name (<fee:name>) for the domain name.

       9.   Added the "refundable" attribute to <fee:fee> elements.

       10.  Added the "grace-period" attribute to <fee:fee> elements.

    10.3.  Changes from 02 to 03

       1.  Added the "applied" attribute to to <fee:fee> elements.

       2.  Simplified the wording in relation to when a server can return an
           error for extended <info> commands.

       3.  Added the <fee:period> element to transfer query responses.

       4.  Removed wording about how servers behave when receiving incorrect
           fee information from transform commands, and put it into a single
           section at the top of the document.

       5.  Allow servers to omit <fee:fee> elements from <fee:cd> elements
           if the command specified by the client is forbidden.

    10.4.  Changes from 03 to 04

       1.  Changed Intended Status to Standards Track.

       2.  As per suggestion from Michael Bauland, the <fee:period> element
           is no longer included in <check> and <info> responses for
           "restore" commands.  It's still mandatory for all other commands.

       3.  Added summary of the attributes for the <fee:fee> element.

       4.  Clarified that the "refundable" and "grace-period" attributes of
           the <fee:fee> elements are dependant on each other and cannot
           appear on their own.

       5.  Removed the option of returning a 1001 response when the fee is
           incorrect.

       6.  Forbidden the inclusion of extension elements in transform
           responses if no fee/credit has been assessed.

       7.  Made the <fee:currency> element optional in transform commands.

       8.  Amended XML Namespace section of IANA Considerations, added EPP
           Extension Registry section.

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    10.5.  Changes from 04 to 05

       1.  Removed the extended <info> command.  The <check> command is the
           only command that can be used now.

       2.  Introduced a mandatory-to-implement "standard" class for non-
           premium domains.

       3.  The decision was made to keep availability info in <check>
           responses as registrars have indicated that it is very useful as
           it avoids unnecessary round trips to the server.

       4.  Allow <fee:credit> elements to be present in <check> responses.

       5.  Allow the number of <fee:fee> which can appear in transform
           responses to be zero.

       6.  Removed the <fee:balance> and <fee:creditLimit> elements from
           transfer query responses.  The reason is that these elements are
           defined as containing the values after the transform command has
           taken place - which means that it is not appropriate to include
           them in a query response.

       7.  Added Implementation Status section.

    10.6.  Changes from 05 to 06

       1.  The specification is now object-agnostic, but works with RFC5731
           [RFC5731] domains by default.

       2.  Renamed the <fee:domain> element to <fee:object>.  Added the
           "objURI" attribute.

       3.  Removed the default value for the "refundable" attribute of <fee:
           fee> elements, and added text about how clients should handle
           such cases.  Added similar text to the documentation of the
           "grace-period" attribute.

       4.  Removed references to the defunct <info> command syntax.

       5.  "MUST" requirements regarding documentation have been changed to
           "must".

       6.  Created separate "Correlation between Refundability and Grace
           Periods" section describing how the "refundable" and "grace-
           period" attributes work together.

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    10.7.  Changes from 06 to 07

       1.  Changed the syntax of the <check> form to be simpler: a single
           set of <fee:command>, <fee:currency> etc elements is applied to
           the objects specified in the main body of the <check> command.

       2.  Simplified the object-agnosticism to simply copy the element from
           the <check> command into the <fee:cd> element.

       3.  Added the "avail" attribute to the <fee:cd> element and added
           commentary about its semantics.

       4.  Added the <fee:reason> element to the <check> response so servers
           can indicate why fee information is not available.

    11.  Normative References

       [ISO4217]  International Organization for Standardization, "ISO 4217:
                  2008, Codes for the representation of currencies and
                  funds", 2008.

       [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
                  Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/
                  RFC2119, March 1997,
                  <http://www.rfc-editor.org/info/rfc2119>.

       [RFC3688]  Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
                  DOI 10.17487/RFC3688, January 2004,
                  <http://www.rfc-editor.org/info/rfc3688>.

       [RFC3915]  Hollenbeck, S., "Domain Registry Grace Period Mapping for
                  the Extensible Provisioning Protocol (EPP)", RFC 3915,
                  DOI 10.17487/RFC3915, September 2004,
                  <http://www.rfc-editor.org/info/rfc3915>.

       [RFC5730]  Hollenbeck, S., "Extensible Provisioning Protocol (EPP)",
                  STD 69, RFC 5730, DOI 10.17487/RFC5730, August 2009,
                  <http://www.rfc-editor.org/info/rfc5730>.

       [RFC5731]  Hollenbeck, S., "Extensible Provisioning Protocol (EPP)
                  Domain Name Mapping", STD 69, RFC 5731, DOI 10.17487/
                  RFC5731, August 2009,
                  <http://www.rfc-editor.org/info/rfc5731>.

       [RFC6982]  Sheffer, Y. and A. Farrel, "Improving Awareness of Running
                  Code: The Implementation Status Section", RFC 6982,
                  DOI 10.17487/RFC6982, July 2013,

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                  <http://www.rfc-editor.org/info/rfc6982>.

       [RFC7451]  Hollenbeck, S., "Extension Registry for the Extensible
                  Provisioning Protocol", RFC 7451, DOI 10.17487/RFC7451,
                  February 2015, <http://www.rfc-editor.org/info/rfc7451>.

       [draft-ietf-eppext-launchphase]
                  Gould, J., Tan, W., and G. Brown, "Launch Phase Mapping
                  for the  Extensible Provisioning Protocol (EPP)", 2014.

    Authors' Addresses

       Gavin Brown
       CentralNic Group plc
       35-39 Moorgate
       London, England  EC2R 6AR
       GB

       Phone: +44 20 33 88 0600
       Email: gavin.brown@centralnic.com
       URI:   https://www.centralnic.com

       Jothan Frakes

       Email: jothan@jothan.com
       URI:   http://jothan.com

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