| J. Gould
| M. Jain
| VeriSign, Inc.
| May 1, 2014

Low Balance Mapping for the Extensible Provisioning Protocol (EPP)
verisign_epp-extension_low-balance_v01

# Abstract

This document describes an Extensible Provisioning Protocol (EPP) mapping for the Low Balance Poll Notification used when an account reaches or goes below the credit threshold.

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# Table of Contents

# 1. Introduction

This document describes an extension mapping for version 1.0 of the Extensible Provisioning Protocol (EPP) [RFC5730]. This EPP extension supports the poll message created by the server when an account reaches or goes below the credit threshold.

# 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.

In examples, "C:" represents lines sent by a protocol client and "S:" represents lines returned by a protocol server. Indentation and white space in examples are provided only to illustrate element relationships and are not a REQUIRED feature of this protocol.

"lowbalance-poll-1.0" is used as an abbreviation for "http://www.verisign.com/epp/lowbalance-poll-1.0". The XML namespace prefix "lowbalance-poll" 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.

# 2. Object Attributes

The EPP Low Balance Poll has attributes and associated values that may be viewed by the sponsoring client or server. This section describes each attribute type in detail.

# 2.1. Currency Attribute Values

All of the currency attributes including the creditLimit, creditThreshold (FIXED), and availableCredit use the XML normalizedString data type to represent the currency value in the currency of the server.

# 3. EPP Command Mapping

A detailed description of the EPP syntax and semantics can be found in the EPP core protocol specification [RFC5730]. The command mapping described here is specifically for use to notify of low balance situations.

# 3.1. EPP <poll> Command

The EPP <poll> command and response is defined in section 2.9.2.3 of [RFC5730]. The Low Balance Notification is included in the EPP <poll> response of [RFC5730].

For the Low Balance Notification, poll messages apply whenever the available credit for an account reaches or goes below the credit threshold. In the case of a Low Balance specific message, a <lowbalance-poll:pollData> element will be included within the <resData> element of the standard <poll> response. The <lowbalance-poll:pollData> element will include a reference to the Low Balance namespace. EPP data contained within the <lowbalance-poll:pollData> element is formatted according to the lowbalance-poll schema.

Example <poll> 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:  <poll op="req"/>
    C:    <clTRID>ABC-12345</clTRID>
    C:  </command>
    C:</epp>

An Low Balance Poll Message consists of the <lowbalance-poll:pollData> element with the following child elements:

<lowbalance-poll:registrarName>
  The registrar / account full name.
<lowbalance-poll:creditLimit>
  The credit limit for the account.
<lowbalance-poll:creditThreshold>
  The lower limit credit threshold for the account. The "type" attribute defines the type of threshold. A "type" value of FIXED indicates that the threshold is a fixed currency amount. A "type" value of PERCENT indicates that the threshold is calculated as the threshold value times the credit limit, represented by the value of <lowbalance-poll:creditLimit>.
<lowbalance-poll:availableCredit>
  The account available credit that is compared against the credit threshold value.

Example <poll> response with the Low Balance Poll Message:

    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="1301">
    S:      <msg>Command completed successfully; ack to dequeue</msg>
    S:    </result>
    S:  <msgQ count="1" id="12345">
    S:    <qDate>2013-03-25T18:20:07.0078Z</qDate>
    S:    <msg>Low Account Balance</msg>
    S:  </msgQ>
    S:  <resData>
    S:    <lowbalance-poll:pollData
    S:      xmlns:lowbalance-poll=
    S:      "http://www.verisign.com/epp/lowbalance-poll-1.0">
    S:      <lowbalance-poll:registrarName>Test Registar
    S:      </lowbalance-poll:registrarName>
    S:      <lowbalance-poll:creditLimit>1000
    S:      </lowbalance-poll:creditLimit>
    S:      <lowbalance-poll:creditThreshold type="PERCENT">10
    S:      </lowbalance-poll:creditThreshold>
    S:      <lowbalance-poll:availableCredit>80
    S:      </lowbalance-poll:availableCredit>
    S:      </lowbalance-poll:pollData>
    S:    </resData>
    S:    <trID>
    S:      <clTRID>ABC-12345</clTRID>
    S:      <svTRID>54322-XYZ</svTRID>
    S:    </trID>
    S:  </response>
    S:</epp>

# 4. Formal Syntax

One schema is presented here that is the Low Balance Poll Mapping schema.

The formal syntax presented here is a complete schema representation of the object mapping suitable for automated validation of EPP XML instances. The BEGIN and END tags are not part of the schema; they are used to note the beginning and ending of the schema for URI registration purposes.

# 4.1. Low Balance Poll Mapping Schema

    BEGIN
    <?xml version="1.0" encoding="UTF-8"?>
    <schema targetNamespace=
      "http://www.verisign.com/epp/lowbalance-poll-1.0"
      xmlns:lowbalance-poll=
      "http://www.verisign.com/epp/lowbalance-poll-1.0"
      xmlns:eppcom="urn:ietf:params:xml:ns:eppcom-1.0"
      xmlns="http://www.w3.org/2001/XMLSchema"
      elementFormDefault="qualified">

      <!-- Import common element types.-->
      <import namespace="urn:ietf:params:xml:ns:eppcom-1.0"
        schemaLocation="eppcom-1.0.xsd"/>

      <annotation>
        <documentation>
          Extensible Provisioning Protocol v1.0
          VeriSign poll notification specification
          for low balance notifications.
        </documentation>
      </annotation>

      <!--Child elements found in EPP commands.-->
      <element name="pollData"
        type="lowbalance-poll:pollDataType"/>

      <!--Child elements of the <notifyData>
      element for the low balance.-->
      <complexType name="pollDataType">
        <sequence>
          <element name="registrarName"
            type="eppcom:labelType"/>
          <element name="creditLimit"
            type="normalizedString"/>
          <element name="creditThreshold"
            type="lowbalance-poll:thresholdType"/>
          <element name="availableCredit"
            type="normalizedString"/>
        </sequence>
      </complexType>

      <complexType name="thresholdType">
        <simpleContent>
          <extension base="normalizedString">
            <attribute name="type"
              type="lowbalance-poll:thresholdValueType"
              use="required"/>
          </extension>
        </simpleContent>
      </complexType>

      <simpleType name="thresholdValueType">
        <restriction base="token">
          <enumeration value="FIXED"/>
          <enumeration value="PERCENT"/>
        </restriction>
      </simpleType>

    <!-- End of schema.-->
    </schema>
    END

# 5. Change History

# 5.1. Version 01

1. Initial version of Internet-Draft format of the Low Balance Poll Mapping, version 1.2.

# 6. Security Considerations

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

# 7. Normative References

[RFC2119] | Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC5730] | Hollenbeck, S., "Extensible Provisioning Protocol (EPP)", STD 69, RFC 5730, August 2009.

# Authors' Addresses