Network Working Group Y. Kawatsura Request for Comments: 3538 Hitachi Category: Informational June 2003
Secure Electronic Transaction (SET) Supplement for the v1.0 Internet Open Trading Protocol (IOTP)
Status of this Memo
This memo provides information for the Internet community. It does not specify an Internet standard of any kind. Distribution of this memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2003). All Rights Reserved.
Abstract
This document describes detailed Input/Output parameters for the Internet Open Trading Protocol (IOTP) Payment Application Programming Interface (API). It also describes procedures in the Payment Bridge for the use of SET (SET Secure Electronic Transaction) as the payment protocol within Version 1.0 of the IOTP.
Table of Contents
1. Introduction....................................................3 1.1 Objectives of this Document.................................3 1.2 Scope of this specification.................................3 1.2.1 The version of IOTP specification.....................3 1.2.2 The version of SET specification......................4 1.2.3 The version of IOTP Architecture document.............4 1.3 Audience....................................................4 1.4 Notation....................................................4 1.5 Terminology.................................................4 2. Requirements & Development Policy...............................4 3. Business Models.................................................5 3.1 Entity models between SET and IOTP..........................5 3.2 Role of Participants........................................5 3.3 Scope of Transaction Types..................................6 3.4 Types of transaction not in scope...........................6 4. Architecture of SET/IOTP........................................7 5. Trading Types of SET/IOTP.......................................7 5.1 Baseline Purchase...........................................7 5.2 Cash Advances...............................................8 5.3 Status Inquiry .............................................8
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6. General Flow of SET/IOTP........................................8 6.1 Baseline Purchase...........................................9 6.1.1 Brand Independent Baseline Purchase...................9 6.1.2 Brand Dependent Baseline Purchase....................13 6.2 Cash Advances..............................................14 6.3 Status Inquiry.............................................15 7. IOTP Payment APIs..............................................16 7.1 Brand Compilation Related API Calls........................16 7.1.1 Find Accepted Payment Brand..........................16 7.1.2 Find Accepted Payment Protocol.......................17 7.1.3 Get Payment Initialization Data......................18 7.1.4 Inquire Authentication Challenge.....................19 7.1.5 Authenticate.........................................19 7.1.6 Check Authentication Response........................19 7.2 Brand Selection Related API Calls..........................20 7.2.1 Find Payment Instrument..............................20 7.2.2 Check Payment Possibility............................21 7.3 Payment Transaction Related API Calls......................22 7.3.1 Start Payment Consumer...............................22 7.3.2 Start Payment Payment Handler........................23 7.3.3 Resume Payment Consumer..............................24 7.3.4 Continue Process.....................................25 7.3.5. Change Process State................................26 7.4 General Inquiry API Calls..................................26 7.4.1 Payment Instrument Inquiry...........................26 7.4.2 Inquire Pending Payment..............................26 7.4.3 Remove Payment Log...................................27 7.5 Payment Related Inquiry API Calls..........................27 7.5.1 Check Payment Receipt................................27 7.5.2 Expand Payment Receipt...............................27 7.5.3 Inquire Process State................................28 7.5.4 Start Payment Inquiry................................29 7.5.5 Inquire Payment Status...............................30 8. SET dependent Process..........................................30 8.1 Relationships between them for IOTP Purchase/Cash Advances.30 8.2 Definition of Identifiers..................................31 8.2.1 Definition of BrandId................................31 8.2.2 Definition of ProtocolBrandId........................31 8.2.3 Definition of ProtocolId.............................33 8.2.4 Relationship between Ids.............................33 8.3 Process prior to Payment...................................34 8.3.1 FindAcceptedPaymentProtocol Function.................34 8.3.2 FindPaymentInstrument Function.......................35 8.3.3 GetPaymentInitializationData Function................36 8.4 Process of Payment.........................................37 8.4.1 StartPaymentConsumer Function........................37 8.4.2 StartPaymentPaymentHandler Function..................41 8.4.3 ContinueProcess Function (Consumer Side).............42
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RFC 3538 SET Supplement for IOTP June 2003
8.4.4 ContinueProcess Function (Payment Handler Side)......43 8.4.5 InquireProcessState Function.........................45 8.5 Payment Receipt............................................45 8.5.1 CheckPayReceipt Function.............................45 8.5.2 ExpandPayReceipt Function............................45 8.6 Status Inquiry.............................................46 8.7 Resume Process.............................................47 8.8 SET Scheme Specific Authentication on IOTP.................47 8.9 SET Bridge ProcessState....................................48 8.9.1 SET Bridge ProcessState of Consumer..................48 8.9.2 SET Bridge ProcessState of Payment Handler...........49 8.10 Relationship between Pay Step and Deliv Step on SET/IOTP..49 8.11 Completion Code...........................................50 8.12 PercentComplete...........................................50 8.13 Severity..................................................51 9. Error Handling.................................................51 9.1 Types of Errors............................................51 9.2 IOTP Level Error (OAC Error)...............................52 9.3 IOTP Level Error (SET Bridge Error)........................52 9.4 SET Level Error (SET Technical Error)......................52 9.4.1 SET Initiation Error.................................52 9.4.2 SET Transaction Error................................53 9.5 SET Level Error (SET Business Error).......................53 10. Security Considerations.......................................54 11. References....................................................54 12. IANA Considerations...........................................55 13. Acknowledgement...............................................55 14. Author's Address..............................................55 15. Full Copyright Statement......................................56
This document is indented for readers who are familiar with the following documents:
1) IOTP Specification Version 1.0 [RFC 2801] 2) SET Specification, in particular Book 2:Programmer's Guide and Book3:Formal Protocol Definition, 3) External Interface Guide to SET Secure Electronic Transaction 4) Internet Open Trading Supplement: Architecture and Payment API [IOTP API]
This chapter describes the requirements and development policies of SET/IOTP.
The requirements of SET/IOTP are as follows:
o To be based on SET specifications. Interoperability at the payment level must be maintained.
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o To not enforce modifications which are specific to SET/IOTP. General features of IOTP should not be tampered with to cater to a particular payment method.
o To keep integrity between IOTP and SET. Inconstancy must not be raised between IOTP and SET elements when they have the same meaning.
The following table describes the trading roles in SET/IOTP.
Trading Roles Role ------------------------------------------------------------- Consumer An Individual who purchases goods and/or services, and pays for the value received by choosing a SET Transaction. This individual corresponds with the CardHolder in SET.
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Merchant An organization that provides goods and/or services for purchase, accepts payment methods, delivers invoices and triggers payment processes.
Payment Handler An organization that processes negotiations on payments including SET payment transactions.
Delivery Handler An Organization that ships digital or physical goods to the Consumer.
IOTP client (Consumer) <---------------> IOTP server (Merchant) ^ Internet ^ | IOTP Payment | IOTP Payment | API | API v v IOTP/Payment Bridge IOTP/Payment Bridge ^ ^ | Existing Payment APIs, e.g., | | SET, Mondex, etc. | v v Existing Payment Software Existing Payment Software
Figure 2 SET/IOTP Architecture
IOTP Application Core (OAC): Software that processes IOTP messages. IOTP Payment Bridge (OPB): Interface between OAC and Existing Payment Software. SET Bridge is also an interface between OAC and SET Core.
Existing Payment Software (EPS): Existing Software that processes Payments. The SET Core is software that supports mechanisms in SET specification from Book1 to Book3. EPS does NOT necessarily have to implement the SET Initiation Processor, which is specified in SET EIG. SET Related Module Both SET related OPB and EPS.
Three steps will take place in a Baseline Purchase in the following order:
(1) Offer Step
Consumer selects goods/services over the Internet, for instance on the web, and then chooses the payment method (SET is selected), the SET brand, the payment currency, and then confirms the invoice.
There are two Offer Process types, Brand Independent and Brand Dependent.
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(1-a) Brand Independent Purchase
In a Brand Independent Purchase, the Merchant sends the TPO Block and Offer Response Block simultaneously after the consumer's purchase decision. The Brand Independent Purchase has the merit of eliminating one round of messages compared with the Brand Dependent Purchase because the contents of the Offer Response Block (for example, the description on the invoice) do not change based on the selected brand.
(1-b) Brand Dependent Purchase
Brand Dependent Purchase is used when the contents of the Offer Response Block are dependent on the selected Payment Brand. With this method, the currency selection and discounts based on payment method can be implemented.
(2) Payment Step
The Consumer confirms the order and then pays for the order with a SET Transaction. The SET Transaction messages will be encapsulated in IOTP Messages.
(3) Delivery Step
After completing the Payment, the Consumer receives the goods/services via either on-line or physical delivery.
Cash Advances can be made via a Value Exchange Transaction in IOTP. A first Payment by SET and a second Payment by some other payment mechanism is supported in Baseline IOTP. The Cash Advance has two types - Brand Independent and Brand Dependent Cases.
IOTP Cash Advances processes can be made with a credit card using an IOTP Value Exchange Transaction. In Cash Advances a first Payment by a SET Transaction, and a second Payment by some other payment mechanism, is supported in Baseline IOTP. The general flow is omitted.
This section provides a summary of SET/IOTP interactions with API calls as in [IOTP Payment API].
The description of parameters hereafter are written as follows:
Parameter name : Mandatory (M) or Optional (O) : Description
For more details on the IOTP Payment APIs, see [IOTP Payment API]. "-" in the Description is the same as description in the [IOTP Payment API].
Notice: Status is the status of SET/IOTP. Though some Fields are specified "#IMPLIED" in [IOTP Payment API], if the fields must be used in SET/IOTP, this document specifies the status as Mandatory, (M).
Receive the payment scheme specific packaged data to generate Brand Component. In this version of SET/IOTP, This API must be called before Find Accepted Payment Protocol function.
Input Parameters ---------------- PayDirection : M : This must be set "Debit". CurrCodeType : M : This should be set "ISO4217-A". CurrCode : M : - Amount : M : - MerchantPayId : M : - MerchantOrgId : M : - WalletId : O : - MerchantData : O : The details are not specified in this document. Output Parameters ----------------- BrandItem : M : See NOTE below.
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NOTE: Parameters of BrandItem ----------------------------- BrandId : M : This is defined in the section 8.2.1. xml:lang : M : - BrandName : M : Brand Name, such as "MasterCard". BrandLogoNetLocn : M : - BrandNarrative : O : This is not specified in this document. BrandPackaged : O : This is not used in the SET/IOTP. Content
Receive the payment scheme specific packaged data to generate the PayProtocol Component.
Input Parameters ---------------- BrandId : M : This is defined in the section 8.2.1. PayDirection : M : This must be set "Debit". CurrCodeType : M : This should be set "ISO4217-A". CurrCode : M : - Amount : M : - MerhcantPayId : M : - MercahntOrgId : M : - WalletId : O : - BrandPackaged : O : This is not used in the SET/IOTP. Content MerchantData : O : This is not specified in the SET/IOTP.
Output Parameters ----------------- ProtocolItem : M : See NOTE below. BrandItem : M : -
NOTE Parameters of ProtocolItem ------------------------------- ProtocolId : M : This is set "SETv1.0". ProtocolBrandId : M : This is set the Payment Protocol Specific ID corresponding to the BrandId as Input Parameter and ProtocolId as the Output Parameter. For the detail, see 8.2.2. xml:lang : M : - ProtocolName : M : This is not specified in this document but must be included the protocol name and its version at least.
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PayReqNetLocn : O : The Net Location indicating where a unsecured Payment Request Message should be sent if this protocol choice is used. SecPayReqNetLocn : O : The Net Location indicating where a secured Payment Request Message should be sent if this protocol choice is used. ProtocolAmount : O : This is not used in the SET/IOTP. PackagedContent PayProtocol : M : The XML Packaged Data, which includes PackagedContent the information for the 1st SET Initiation Process. See for the details to section 8.3.1. Brand : M : In this document, BrandId, which is the same as Input Parameter,must be set ONLY. See NOTE below. CurrencyAmount : M : See NOTE below. ProtocolBrand : M : Multiple Components are not arrowed in the current version of SET/IOTP.
Note Parameters of CurrencyAmount --------------------------------- CurrCodeType : M : This should be set "ISO4217-A". CurrCode : M : - Amount : M : -
Note Parameters of Brand ------------------------ BrandId : M : -
This API is used to get the packaged content in Payment Component.
Input Parameters ---------------- BrandId : M : See the details of section 8.2.1. MerchantPayId : M : - PayDirection : M : This is set "Debit". CurrCodeType : M : This is set "ISO5217-A". CurrCode : M : - Amount : M : - OkFrom : M : - OkTo : M : - ReceiverOrgId : M : Organization ID which is used to get TradingRolePackagedContents, which depend on the organizations for each. MerchantOrgId : M : -
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ProtocolId : M : This field must be set "SETv1.0". WalletId : O : - PassPhrase : O : - ProtocolBrand : M : - BrandPackaged : O : This is not used in the current version Content of SET/IOTP. ProtocolAmount : O : This is not used in the current version PackagedContent of SET/IOTP. PayProtocolPackaged: M : This field is copied from the Content PayProtocol Component. OrderPackaged : M : Packaged Data regarding the Order data, Content which the Merchant's OAC sets. BrandSelBrandInfo : O : This is not used in the current PackagedContent version of SET/IOTP. BrandSelProtocol : O : This is not used in the AmountInfoPackaged current version of SET/IOTP. Content BrandSelCurrency : O : This is not used in the AmountInfo current version of SET/IOTP. PackagedContent
Output Parameters ----------------- OkFrom : M : - OkTo : M : - OrderPackaged : M :Changed OrderPackagedContent if Content it rewrites the order information. Otherwise, passed the same input data to OAC. TradingRole : O : The receiver depended PackagedContent TradingRolePackagedContent. The Name Attribute of the packaged contents must include "Payment:" as the prefix, for example "Payment:SET-OD". Multiple TradingRoleData may be returned.
This API is used to get the Payment Instruments that can be accepted by the Payment Handler on behalf of the Merchant.
Input Parameters ---------------- BrandId : M : See the details of section 8.2.2. ProtocolId : M : This must be set "SETv1.0". PayDirection : M : This must be set "Debit". CurrCodeType : M : This should be set "ISO5217-A". CurrCode : M : - Amount : M : - ConsumerPayId : M : - WalletId : O : - ProtocolBrand : M : - BrandPackaged : O : This is not used in the current Content version of SET/IOTP. ProtocolAmount : O : This is not used in the current PackagedContent version of SET/IOTP. PayProtocolPackaged: M : See details for section 8.3.1. Content
Output Parameters ----------------- PayInstrument : M : Multiple PayInstrument Ids may be returned. See NOTE below.
NOTE Parameters of PayInstrument -------------------------------- Id : M : This must be unique each SET Certificates which the Consumer can use. xml:lang : M : - PayInstName : M : -
If the SET Bridge receives this API Message, the SET Bridge returns three packaged content fields.
Input Parameters ---------------- BrandId : M : This is set the consumer selected BrandId. PaymentInstrumentId: M : This is set the consumer selected PaymentInstrumentID. PayDirection : M : This is set "Debit". CurrCodeType : M : This is set "ISO4217-A". CurrCode : M : - Amount : M : - ProtocolId : M : This must be set "SETv1.0". WalletId : O : - Passphrase : O : - ConsumerPayId : M : - ProtocolBrand : M : This is set the consumer selected ProtocolBrand Component. BrandPackaged : O : This is not used in the current Content version of SET/IOTP. ProtocolAmount : O : This is not used in the current PackagedContent version of SET/IOTP. PayProtocol : M : This field is copied from the PayProtocol PackagedContent Component
Output Parameter --------------- BrandSelBrandInfo : O : This is not used in the current PackagedContent version of SET/IOTP. BrandSelProtocol : O : This is not used in the AmountInfoPackaged current version of SET/IOTP. Content
BrandSelCurrency : O : This is not used in the AmountInfoPackaged current version of SET/IOTP. Content
In SET/IOTP, this API is used for the Consumer's SET Bridge to process the 1st SET Initiation and any subsequent SET messages.
Input Parameters ---------------- BrandId : M : ID for the consumer selected Brand. See the details of section 8.2.1. PaymentInstrumentId: M : ID for the consumer selected Instrument. CurrCodeType : M : The consumer selected CurrCodeType. CurrCode : M : The consumer selected CurrCode. Amount : M : The consumer selected Amount. PayDirection : M : Indicates the payment direction from the Consumer's prospective. ProtocolId : M : The consumer selected ProtocolId. OkFrom : M : - OkTo : M : - ConsumerPayId : M : - WalletID : O : - Passphrase : O : - CallBackFunction : O : This is not used in the SET/IOTP. CallBackLanguage : O : This is not used in the SET/IOTP. List ProtocolBrand : M : ID for the consumer selected Protocol dependent Brand information. BrandPackaged : O : This is not used in the current Content version of SET/IOTP. ProtocolAmount : O : This is not used in the current PackagedContent version of SET/IOTP. PayProtocolPackaged : M : See section 8.2.2. Content
Output Parameters ----------------- ContStatus : M : "Continue" must be set if there is in no problem PaySchemePackaged : M : See section 6.5.1. Content
This API is used to initiate a payment on the Payment Handler's side. The SET Related Module does a payment initialization. The SET Related Module processes SET Message received and returns the appropriate SET Message (e.g., 2nd SET Initiation or SET PinitRes message).
Input Parameters ---------------- BrandId : M : ID for the consumer selected Brand. See the details of section 8.2.1. ConsumerPayId : O : ID for the consumer generated payment transaction. CurrCodeType : M : The consumer selected CurrCodeType. This should be set "ISO4217-A". CurrCode : M : The consumer selected CurrCode. Amount : M : The consumer selected Amount. PayDirection : M : This is set "Debit". ProtocolId : M : The consumer selected ProtocolId. This must be set "SETv1.0". OkFrom: : M : - OkTo : M : - PaymentHandlerPayId: M : - MerchantOrgId : M : - WalletID : O : - Passphrase : O : - CallBackFunction : O : This is not used in the SET/IOTP. CallBackLanguage : O : This is not used in the SET/IOTP. List BrandPackaged : O : This is not used in the current Content version of SET/IOTP. ProtocolAmountP : O : This is not used in the current PackagedContent version of SET/IOTP. PayProtocolPackaged: M : - Content ProtocolBrand : M : Information for the consumer selected Protocol dependent Brand. BrandSelBrandInfo : O : This is not used in the current PackagedContent version of SET/IOTP. BrandSelProtocol : O : This is not used in the AmountInfo current version of SET/IOTP. PackagedContent BrandSelCurrency : O : This is not used in the AmountInfo current version of SET/IOTP. PackagedContent
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TradingRolePackaged: O : Copied from the TradingRoleData Content Component. The Name Attribute of the packaged contents must include "Payment:" as the prefix, for example "Payment:SET-OD". PaySchemePackaged : M : See section 6.5.2. Content
Output Parameters ----------------- PaySchemePackaged : M : See section 6.5.2. Content ContStatus : M : "Continue" must be set if there is no problem.
This API is used to restart a payment transaction when the transaction is suspended for some reason such as a time out. The last SET Message relevant to this suspended transaction is returned as the Response.
Input Parameters ---------------- ConsumerPayId : M : - WalletId : O : - PassPhrase : O : - CallBackFunction : O : This is not used in the current version of SET/IOTP. CallBack : O : This is not used in the current version LanguageList of SET/IOTP.
Output Parameters ----------------- ContStatus : M : - PaySchamePackaged : M : See section 8.7. Content
This API is used to pass a SET related message, received from the counter party, to the SET Bridge, and accept the next SET message as a response.
(1) Consumer Side Payment Bridge
Input Parameters ---------------- PayId : M : Set ConsumerPayId WalletId : O : - PassPhrase : O : - PaySchemePackaged : M : See section 8.4.3. Content
Output Parameters ----------------- ContStatus : M : Set "End" if SET PRes message is received in the PaySchemePackagedContent as the input parameter, otherwise set "Continue". PaySchemePackaged : O : If ContStatus is set "End", this is not Content used. See 8.4.3.
(2) Payment Handler Side Payment Bridge
Input Parameters ---------------- PayId : M : Set PaymentHandlerPayId WalletId : O : - PassPhrase : O : - PaySchemePackaged : M : See section 8.4.4. Content
Output Parameters ----------------- ContStatus : M : Set "End" if SET PRes message is received in the PaySchemePackagedContent as the output parameter, otherwise set "Continue". PaySchemePackaged : M : See section 8.4.4. Content
This API is used by the OAC to change the Process State of the OPB. For instance, it is used to change the Payment Status after a SET Payment Transaction was completed. When an error or suspend happens, this API is also used.
(1) Consumer Side Payment Bridge
Input Parameters ---------------- PayId : M : Set ConsumerPayId ProcessState : M : - CompletionCode : M : - ProcessType : M : - WalletID : O : - PassPhrase : O : -
Output Parameters ----------------- ProcessState : M : - CompletionCode : M : - PercentComplete : O : See section 8.13. xml:lang : O : - StatusDesc : O : This field is not specified in SET/IOTP.
This API is used to check a Payment Receipt. However since the current SET specification does not support Receipts, SET/IOTP sends its own visual information of a Receipt to the SET Bridge.
Input Parameters ---------------- PayId : M : - WalletId : O : - PassPhrase : O : - PaySchemePackaged : M : See section 8.5.1. Content
Output Parameters ----------------- There is no output Parameter.
This expands an IOTP Payment Receipt Component packaged data into a form which may be used for display or printing purposes.
Input Parameters ---------------- PayId : M : - WalletId : O : - PassPhrase : O : - PackagedContent : M : See section 8.5.2.
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Output Parameters ----------------- BrandId : M : - ProtocolBrandId : M : - PayInstrumentId : M : - PaySchemePayId : M : LID_M in the SET PRes message is set. (The format of this value must be same as SET Initiation.) Amount : M : Amount * AuthRatio (or CapRatio if available). CapRatio should be the high priority than AuthRatio. CurrCodeType : M : - CurrCode : M : - PayDirection : M : - ProtocolId : M : - ProtocolTransId : O : - TimeStamp : M : This value should be used the Date field of MessageWrapper in the SET PRes message xml:lang : O : This is not used in the SET/IOTP. ConsumerDesc : O : This is not used in the SET/IOTP.
PaymentHandlerDesc : O : This is not used in the SET/IOTP. StyleNetLocn : O : This is not used in the SET/IOTP. PaymentProperty : O : This is not used in the SET/IOTP.
This API is used to check the payment status. For example, when the OAC receives a Continue Payment Response API, it uses this API if the ContStatus is set to "End". This API can be used at anytime.
(1) Consumer Payment Bridge
Input Parameters ---------------- PayId : M : Set ConsumerPayId WalletId : O : - PassPhrase : O : -
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Output Parameters ----------------- ProcessState : M : - PercentComplete : O : See 8.13 for the guideline of setting value. CompletionCode : O : See section 8.12. xml:lang : O : - StatusDesc : O : - PayReceiptNameRefs : O : This is not used in the SET/IOTP. PayReceiptPackConts: O : This is not used in the SET/IOTP.
(2) Payment Handler Payment Bridge
Input Parameters ---------------- PayId : M : Set PaymentHandlerPayId WalletId : O : - PassPhrase : O : -
Output Parameters ----------------- ProcessState : M : - PercentComplete : O : See section 8.13 for the guideline of setting value. CompletionCode : O : See section 8.12. xml:lang : O : - StatusDesc : O : - PayReceiptNameRefs : O : This is set "PRes". PayReceiptPackConts: O : This is not used in the SET/IOTP.
The Payment Handler uses this API request for Consumer initiated inquiry processing. In SET/IOTP, the Payment Handler's SET Bridge receives a SET InqReq message in an InquirePaymentDetail API. The SET Core processes it, and creates a SET InqRes message. The response encapsulates the SET InqRes message.
Input Parameters ---------------- PaymentHandlerPayId: M : - WalletID : O : - PassPhrase : O : - PaySchemePackaged : M : See section 8.6. Content
Output Parameters ----------------- PaymentHandlerPayId: M : - ProcessState : M : - CompletionCode : O : - xml:lang : O : - StatusDesc : O : - PaySchamePackaged : M : See section 8.6. Content
This chapter describes the core concepts for the development of SET/IOTP.
8.1 Relationships between them for IOTP Purchase/Cash Advances
This document describes SET Initiation Messages based on the [SET EIG]. Merchant sends the 1st SET Initiation Message to the Consumer in order to activate a SET payment transaction. After this message, the other SET Initiation Messages (JPO, etc.) and the SET payment Transaction (SET PinitReq message, etc.) are exchanged between the Consumer and the Payment Handler.
Figure 11 Relationship between IOTP Messages and SET Messages
When the Merchant sends any data (e.g., SET SaleDetail) except a SET Related messages (e.g., SET PinitRes message), it can send it by two different methods:
(a) The Merchant sends the data via the Consumer. (b) The Merchant sends the data out-of-band.
In case (a), the Merchant sends the data by encapsulating it into TradingRoleData.PackagedContent inside the Offer Response Block sent to Consumer. The data is copied to the Payment Request Block and sent to the Payment Handler. This case assumes that the format of the data is already agreed upon between the Merchant and the Payment Handler.
<Premise> SET BrandID is defined as brand[:Product]. ([] is indicated as optional.) In SET, The brandID is a brand name, which corresponds to the brand of the payment card. Additionally the Product is a product name, which is defined as the type of product within the specific brand such as Gold Card.
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Set IOTP ProtocolBrandId as follows:
brand:Product:PCN
In here,
o The brand above is the same as the sub data of SET BrandID, as Brand Name (brand), defined in SET. o Product above is the same as the sub data of SET BrandID, as Product Name (Product), defined in SET. o PCN above is the Promotional Card Name, and is written in the SET Certificates.
Example:
Visa:Gold:WalMart
Since SET Brand ID has a colon between brand and Product, the two colons should be able to delimit Brand, Product, and PCN.
Product and PCN can omit if necessary. For the detail of these definitions are follows:
(1) The case of omitting Product
Definition: brand::PCN Example: VISA::UC_VISA
(2) The case of omitting PCN
Definition: brand:Product Example: VISA:Gold
(3) The case of omitting Product, PCN
Definition: brand Example: VISA
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Invalid Examples: VISA:Gold: VISA:: VISA: ProtocolBrandId which there is no brand.
ProtocolBrandId must be unique and depends on BrandId and ProtocolId. The followings are map among BrandId and ProtocolId, which have registered in IANA, and ProtocolBrandId.
Regarding to the BrandIds except above, the BrandId registrant (e.g., credit card company) MUST register it in order to be able to map one to one between ProtocolBrandId and the pair of BrandId and ProtocolId.
Name : O : This is not used in SET/IOTP. Content : M : This should be set "PCDATA". Transform : M : This is set "BASE64". ContentData : M : SET specific protocol data. Includes data that is used to create the 1st SET Initiation Message that is not contained in other IOTP elements.
(2) Parameter in the ContentData
Parameters of ContentData are described below. The Field Values follow the [SET EIG].
Returns a list of Payment Instrument IDs related to the BrandId and ProtocolBrandId. In this document, BrandId and ProtocolId are defined in section 8.2.
In this document, Brand has two recognized meanings in SET/IOTP, as follows:
Brand as Primary Brand: The Primary Brand is the Brand which is defined as brand in SET, such as VISA, MasterCard, Nicos.
Brand as Dual Brand or Promotional Brand: The Dual Brand is the payment instrument which has two Brand, such as UC-VISA (UC Card and VISA Card) This style is popular in Japan.
A Promotional Brand means that, if the Consumer pays with that Brand, then the Consumer will receive some additional benefit such as discount or frequent flyer point.
1. ProtocolBrandId as a Primary Brand
Example:
"MasterCard", "MasterCard::UC", "MasterCard:Gold:" and "MasterCard::WalMart" are all MasterCard Brands.
2. ProtocolBrandId as a Dual Brand or a Promotional Brand
Example:
"MasterCard::UC" is Dual Brand of "MasterCard" and "UC". "SET:MasterCard::WalMart" is Promotional Brand of MasterCard- WallMart.
The SET Bridge receives the ProtocolBrandId from the OAC in the FindPaymentInstrument Function,
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(1) If the accepted ProtocolBrandId is XXX:YYY
The SET Related Module searches for ProtocolBrandIds with the string "XXX:YYY:*" (* is wild card), the corresponding PaymentInstrumentIds of all ProtocolBrandIds with the matching Primary Brand (regardless of also being a Dual Brand or Promotional Brand) will be returned to the OAC, for the Consumer to select from.
(2) If the accepted ProtocolBrandId is XXX:YYY:ZZZ
The SET Related Module searches for ProtocolBrandIDs with the string "XXX:YYY:ZZZ", only the corresponding PaymentInstrumentIds of the ProtocolBrandIds that match the Dual Brand or Promotional Brand will be returned to OAC, for the Consumer to select from.
Example:
Assume ProtocolBrandIds are correspond to PaymentInstrumentIds in the SET Bridge as follows,
If the SET Bridge receives a ProtocolBrandId as "MasterCard" in the FindPaymentInstrument Function, the SET Bridge will return "1","2", and "3". However, if the SET Bridge receives a ProtocolBrandId as "MasterCard::UC" to OAC, SET Bridge will returns only "2".
If necessary, The SET Related Module generates TradingRolePackagedContent corresponded to the received ReceiverOrgID. The ContentData of TradingRolePackagedContent is the information which the Payment Handler needs to process the SET Transaction (for example, the SET SaleDetail. and the SET OD). The ContentData, Content, and the Transform must be agreed upon between the Merchant and the Payment Handler beforehand.
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The Name Attribute of the packaged contents must include "Payment:" as the prefix, for example "Payment:SET-OD". If there is no PackagedContent corresponding to ReceiverOrgID, such that the SET Related Module does not need to create the PackagedContent, the TradingRolePackagedContent is not created.
Parameters in TradingRolePackagedContent ---------------------------------------- Name : O : This is not specified in the current SET/IOTP. Content : M : Should be identical between the Payment Handler and the Merchant. Transform : M : Should be identical between the Payment Handler and the Merchant. ContentData : M : Element Data for the Payment Handler to process the SET Transaction. Should be identical between the Payment Handler and the Merchant.
Since there are similar items between the SET Initiation Message Fields and IOTP Elements, IOTP elements can be used for the corresponding SET Initiation Fields. Other SET Initiation Fields, except URL information (for detail, see below), is encapsulated in the PayProtocolPackagedContent.
This document does not specify how the SET Related Module implements the 1st SET Initiation Process.
The following table shows the list of SET Initiation Fields that corresponds to IOTP Elements.
SET Initiation Field IOTP Element (in TPO.Brandlist) --------------------------------------------------------------- SET-Version Consumer selected ProtocolId SET-Brand Consumer selected ProtocolBrandId SET-Amount Consumer selected Amount Data in CurrencyAmount. -------------------------------------------------------------- SET Initiation Field IOTP Element (in OfferResp) -------------------------------------------------------------- Order Description The hash data of ContentData of PackagedContent of Order Component.
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(b) SET-Version:
SET-Version can be corresponded to ProtocolId. The version number appears after the "v" for the SET-Version.
ProtocolId -> _______ SETv1.0 ~~~<- SET-Version
Figure 12 ProtocolId vs SET-Version
(c) SET-Brand:
SET-Brand can be corresponded to ProtocolBrandId.
(d) SET-PurchAmt: It is necessary to adjust the format of the Amount between IOTP and SET, since IOTP and SET use different syntax.
Assumption:
o In SET/IOTP, The "ISO4217-A" (the currency code which is represented by three alphabet, such as "USD") is mandatory.
o Consumer Side SET Related Module should have a mapping table between "ISO4217-A" and "ISO4217-N" (the currency code which is represented by three digit, such as "840").
(d) -1 Content of the SET-PurchAmt
The content of the SET-PurchAmt is as follows:
SET PurchAmt: currency amount amtExp10
For a description see [SET] Book 2, page 299. For example, $129.50 is represented by "840 12950 -2". In this case, the corresponding values for the "currency", "amount" and "amtExp10" are "840", "12950" and "-2" respectively.
(d) -2 Content of IOTP Amount Elements
The content of the three IOTP amount elements consist of the following: Amount, CurrCodeType and CurrCode. For a description of each, see [RFC 2801]. For example, $129.50 is represented by the following:
CurrCodeType="ISO4217-A" CurrCode="USD"
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Amount="129.50"
(d) -3 Example of how-to-translate
The one-to-one mapping between the IOTP format and the SET format is very simple. This example of sequence below uses the example of IOTP amount Element above.
1) Translate from IOTP CurrCode (ISO4217-A) to SET currency (ISO- 4217-N). For example, if CurrCode="USD", then the value of currency is "840".
2) Calculate how many decimal places are represented in the Amount. For example, if Amount="129.50", there are "2" decimal places.
3) [The number of decimal places] *( -1) corresponds to the SET amtExp10. In the above case, SET amtExp10 = 2 * (-1) = -2.
4) 10^[The number of the Amount's decimal places] * Amount corresponds to the SET amount. In the above example, SET amount = 10^2 * 129.50 = 12950.
5) Concatenate three integers and use white spaces as a delimiter.
Finally, in the above case, the SET PurchAmt is represented as "840 12950 -2".
(e) SET OD (Order Description) vs. IOTP Order Information
In the IOTP, the OAC handles the Order Information, such as display use, as SET uses the Order Information. Payment Handler does not know the actual Order Information because the Merchant and Payment Handler may exist in the separate domains. However, Payment Handler needs to get the SET OD from Merchant via the Consumer or directly because Payment Handler needs the SET OD to create 2nd SET Initiation message and after. In this situation, the Merchant should not pass the actual order information to the Payment Handler because the order information may be considered private data. Therefore, SET/IOTP defines SET OD as the hash of IOTP Order Information. The hash algorithm must be SHA1.
But the Order Component may be included two or more Packaged Content (see [RFC 2801]). Therefore SET/IOTP specifies to create hash as follows:
(e) -1. If the Name attribute does not have the Name attribute, such that the Order Component have only one Packaged Content, hash the Contents Data using SHA1 simply and be encoded by BASE64.
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(e) -2. Otherwise, such that there exists the Name attribute, sort the Packaged Contents in the UTF-16 character code order of Name attribute and hash the Content Data using SHA1 and concatenate them in proper sequence, then hash it using SHA1 again and be encoded by BASE64.
NOTE: To avoid different character encodings between applications, in this document, SET OD MUST be constructed from the ContentData in OrderPackagedContent as follows:
(1) Convert it to network byte ordered Unicode encoding data. (2) Hash (1) using SHA1 (3) Convert (2) to BASE64 US-ASCII data
Therefore, "Content-Type","charset" MUST be "text/plain","us-ascii" respectively when SET Initiation message is constructed.
(f) SET-***-URL vs. IOTP Net Location
In IOTP, the OAC handles location data therefore the OAC does not need to pass net location data on to the OPB. However, some vender implemented consumer SET/IOTP wallets may need the URL information to process the SET Initiation. Thus, if necessary, the Consumer's SET Related Module must set appropriate URL data to SET-***-URL.
(2) Create the next SET related message
Generate SET related message (SET PInitReq or SET Initiation Response) at the SET Related Module, to be sent to the Payment Handler.
(3) Error check of the next SET related message.
If SET related message which is created in (2) is SET Initiation Response and includes any error in it, SET Related Module creates an ErrorResponse message with ErrorCode to "EncapProtErr" and the Severity to "HardError" and sent it to the OAC.
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(4) Create PaySchemePackagedContent
The followings are the parameter of PaySchemePackagedContent in StartPaymentConsumerResponse.
ContentData : M : SET Related Message which is encoded by BASE64. (e.g., SET PinitRes message or SET Initiation Response Message) Name : O : This is not used in the current SET/IOTP. Content : M : This field should be set to "PCDATA". Transform : M : This must be set "BASE64".
(5) Store of the Payment Information
SET Bridge should store the following in the DataBase:
o ConsumerPayId o PaySchemePackagedContent o ContStatus o ContentSoftwareId (corresponding to the PaySchemePackagedContent) o ProcessState
SET Bridge must processes appropriately, for example pass it to the SET Core, if there exists the TradingRolePackagedContent as the input Parameter.
(2) SET Specific Process
The SET Related Module processes the SET Initiation Response or the SET Transaction (SET PInitReq). In addition, the SET Related Module generates a message (the next SET Initiation Message or SET PInitRes) corresponding to the results of the processed message. This message will be sent to the Consumer.
(3) Error check of the next SET related message.
If SET related message which is created in (2) includes any error, SET Related Module create an ErrorResponse message with ErrorCode to "EncapProtErr" and the Severity to "HardError" and sent it to the OAC.
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(4) Generate PaySchemePackagedContent
PaySchemePackagedContent which Encapsulate the SET Initiation Message or SET PInitRes into ContentData and generate the PaySchemePackagedContent. The Parameters of PaySchemePackagedContent as Output is as follows:
ContentData : M : SET Related Message which is encoded by BASE64 (e.g., SET PinitRes message or SET Initiation Response Message). Name : O : This is not used in the current SET/IOTP. Content : M : This field should be set to "PCDATA". Transform : M : This must be set "BASE64"
The Parameters of PaySchemePackagedContent as Input is as follows:
ContentData : M : SET Related Message which is encoded by BASE64 (e.g., SET PinitRes message, SET PRes message or SET Initiation Response Message). Name : O : This is not used in the current SET/IOTP. Content : M : This field should be set to "PCDATA". Transform : M : This must be set "BASE64"
SET Related Module processes the SET Related Message in the PaySchemePackagedContent, then SET Related Message corresponding to the processed message is created if necessary.
(2) SET Related Message Error Check
If SET related message which is created in (2) includes any error, SET Related Module create an ErrorResponse message with ErrorCode to "EncapProtErr" and the Severity to "HardError" and sent it to the OAC.
(3) Create PaySchemePackagedContent
The followings are the parameter of PaySchemePackagedContent in ContinueProcessResponse.
ContentData : M : SET Related Message which is encoded by BASE64 (e.g., SET PinitReq message, SET PReq message or SET Initiation Response Message).
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Name : O : This is not used in the current SET/IOTP. Content : M : This field should be set to "PCDATA". Transform : M : This must be set "BASE64".
If the ContentData which has received from Payment Handler is SET PRes message, this data is not created.
8.4.4 ContinueProcess Function (Payment Handler Side)
(1) Brand Integrity Check between IOTP Elements and SET Elements
Since the Consumer sets the Amount and Brand in the SET Message, based on the IOTP message, it might be altered when the IOTP message is copied to the SET message. Thus, the Payment Handler needs to check the Elements in IOTP components (Payment, etc.) and the Elements in the SET message to make sure they are consistent. The IOTP Brand specified by the Merchant should correspond to the Brand used in the SET payment.
The Brand Integrity check sequence is as follows:
(a) After receiving the SET PReq message, check the Consumer selected Brand information (e.g., ProtocolBrandId) in the IOTP Payment Request against information in the SET certificate in the SET PReq message.
(b) If they do not match, return a SET Bridge Level Error (Severity="HardError", ErrorCode="AttNotValid" and Names="BrandId").
Additionally, the SET PReq message signature must be verified with the SET CardHolder's certificate. (This is done during a normal SET Transaction.)
NOTE: This integrity check is necessary evenif There is no Promotional Card Name in the ProtocolBrandId because SET may have selected the MasterCard even though IOTP has selected the VISA.
(2) SET Related Process
Encapsulate the SET related Message (SET Initiation Message or SET Transaction Message) in to Content Data of PaySchemePackagedContent and send it to the Sender.
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The followings are the parameters of PaySchemePackagedContent as output.
ContentData : M : SET Related Message which is encoded by BASE64 (e.g., SET PinitReq message, SET PReq message or SET Initiation Response Message). Name : O : This is not used in the current SET/IOTP. Content : M : This field should be set to "PCDATA". Transform : M : This must be set "BASE64".
(3) SET Related Message Error Check
If SET related message which is created in (2) includes any error, SET Related Module create an ErrorResponse message with ErrorCode to "EncapProtErr" and the Severity to "HardError" and sent it to the OAC.
If SET related message which is created in (2) is SET PRes message, and its message includes except:
(a) CompletionCode in SET PRes message is "authorizationPerformed" and AuthCode is "Approved" or (b) CompletionCode in SET PRes message is "capurePerformed" and CapCode "Success",
SET Related Module create ErrorResponse message with ErrorCode to "BusinessError"and the Severity to "HardError" and sent it to the OAC.
(4) Create PaySchemePackagedContent
The followings are the parameter of PaySchemePackagedContent in ContinueProcessResponse.
ContentData : M : SET Related Message which is encoded by BASE64 (e.g., SET PinitRes message, SET PRes message or next SET Initiation Message). Name : O : "PRes" only if ContentData includes SET PRes message, otherwise this is not used in the current SET/IOTP. Content : M : This field should be set to "PCDATA". Transform : M : This must be set "BASE64".
If ContentData includes the SET PRes message, ContStatus MUST be "End".
SET Related Module does not check the Payment Receipt Information especially, sends the general response message as long as valid request message.
The Parameters of PayReceiptPackagedContent are followings:
Name : O : This MUST be set "PRes" Content : M : This field should be set to "PCDATA". Transform : M : This must be set "BASE64". ContentData : M : SET PRes message which is encoded by BASE64.
The Parameters of PayReceiptPackagedContent are as follows:
Name : O : This MUST be set "PRes" Content : M : This field should be set to "PCDATA". Transform : M : This must be set "BASE64". ContentData : M : SET PRes message which is encoded by BASE64.
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(2) Get the current status information
SET Related Module gets out the following element from Data Base using ConsumerPayId, PaymentHandlerPayId as keys.
o BrandId o ProtocolBrandId o PayInstrumentId o Amount o CurrCodeType o CurrCode o PayDirection
(3) Get the SET Data
SET Related Module gets the following data from SET PRes message which take as the Request Message.
(a) Date Field in the MessageWrapper Date field between SET and IOTP is slightly different. The different things are as follows:
o There is no TimeZone in the Date field of SET.
o Second and Milli-second can be omitted in the Date field of SET
Therefore, SET Related Module needs to compensate the Date information when TimeStamp field is set.
(b) AuthRatio in SET PRes message. (CapRatio is high priority than AuthRatio if available.)
(c) LID_M in SET PRes message. (The style of this value is the same as it of SET Initiation message.)
In SET/IOTP, SET Inquiry Initiation is not supported (i.e., omitted). SET Inquiry Messages are embedded in the PaySchemeData element in IOTP Inquiry Messages.
The Parameters of PaySchemePackagedContent in StartPaymentInquiryResponse are follows:
Name : O : This is not used in the SET/IOTP. Content : M : This field should be set to "PCDATA". Transform : M : This must be set "BASE64". ContentData : M : SET InqReq message which is encoded by BASE64.
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The Parameters of PaySchemePackagedContent in InqurePaymentStatus are follows:
Name : O : This is not used in the SET/IOTP. Content : M : This field should be set to "PCDATA". Transform : M : This must be set "BASE64". ContentData : M : SET InqReq message which is encoded by BASE64.
The Parameters of PaySchemePackagedContent in InquirePaymentStatusResponse are follows:
Name : O : This is not used in the SET/IOTP. Content : M : This field should be set to "PCDATA". Transform : M : This must be set "BASE64". ContentData : M : SET InqRes message which is encoded by BASE64.
The Parameter of PaySchemePackagedContent in ContinueProcess are follows:
Name : O : This is not used in the SET/IOTP. Content : M : This field should be set to "PCDATA". Transform : M : This must be set "BASE64". ContentData : M : SET InqRes message which is encoded by BASE64.
The Parameter of PaySchemePackagedContent in RequmePaymentConsumerResponse are as follows:
Name : O : This is not used in the SET/IOTP. Content : M : This field should be set to "PCDATA". Transform : M : This must be set "BASE64". ContentData : M : SET Related Message which is encoded by BASE64 (e.g., SET PinitRes message or SET Initiation Response Message).
No Status ----> InProgress : When StartPaymentConsumer Function is called
InProgress ---> InProgress : When ContinueProcess Function is called : When ChangeProcessState Function (ProcessState="Failed") is called
InProgress ---> ProcessError : When ChangeProcessState Function (ProcessState="ProcessError") is called : The Technical Error (Hard Error) is occurred in SET Bridge
InProgress ---> CompletedOK : When ChangeProcessState Function (ProcessState="CompletedOK") is called
InProgress ---> Failed : When ChangeProcessState Function (ProcessState="failed") is called : The Business Error is occurred in SET Bridge
InProgress ---> Suspended : When ChangeProcessState Function (ProcessState="Suspended") is called : ErrorCode="ResumeRequired" is is occurred.
Suspend ---> InProgress : ResumePaymentConsumer Function is called
Suspend ---> ProcessError : When ChangeProcessState Function (ProcessState="ProcessError") is called (the Technical Error is occurred prior to ResumePayment- Consumer Function call) : The Technical Error (Hard Error) is occurred in SET Bridge (the Technical Error is occurred while ResumePaymentConsumer is calling)
No Status ----> InProgress : When StartPaymentPaymentHandler is called
InProgress ---> InProgress : When ContinueProcess Function is called : When ChangeProcessState Function (ProcessState="Failed") is called
InProgress ---> ProcessError : When ChangeProcessState Function (ProcessState="ProcessError") is called : The Technical Error (Hard Error) is occurred in SET Bridge : SET Error Message is occurred
InProgress ---> CompletedOK : When SET Transaction is completed.
InProgress ---> Failed : When ChangeProcessState Function (ProcessState="failed") is called : The Business Error is occurred in SET Bridge
CompletedOK ---> Failed : When ChangeProcessState Function or CancelPayment Function (ProcessState="Failed") is called and the payment is cancelled.
8.10 Relationship between Pay Step and Deliv Step on SET/IOTP
SET/IOTP recommends the following regarding Delivery:
Physical Goods -------------- For physical goods, the IOTP Delivery Exchanges should be omitted. That is, set DelivExch=False and DelivAndPayResp=False in the Delivery Component. This is to avoid the situation where the IOTP Delivery Handler must check with the IOTP Payment Handler on the status of a credit authorization. When a Delivery Inquiry transaction might occur, the DelivReqNetLocn attribute in the DeliveryData Element must have been specified at the time of the original Offer Response Message. If you want to use the Delivery Exchange, you need to process the inquiry of the credit authorization out of IOTP between IOTP Payment Handler and Delivery Handler.
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Digital Goods ------------- For digital goods sold through SET/IOTP, authorization should be processed on a real-time basis.
In SET/IOTP, the CompletionCode, which is a Business Error Code, is set as follows:
Value Description ------------------------------------------------------ BrandNotSupp This value is not used. CurrNotSupp This value is not used. AuthError The IOTP Authentication has failed for any reason. InsuffFunds This value is not used. InstBrandInvalid This value is not used. PaymentDecl A SET business failure has occurred. InstNotValid This value is not used. BadInstrument This value is not used. Unspecified Unspecified error. There is some known problem or error, which does not fall into one of the other CompletionCodes.
This document recommends to set the PercentComplete as follows:
SET Related Setting for Setting for Value of Message Consumer Paymnet Handler PercentComplete ------------+---------------+------------------+----------------- SET Initia- |After 1st SET |After 1st SET |20 tion |Initiation |Initiation | |Response has |Response has | |Cteated |Processed | |(See Note) |(See Note) | ------------+---------------+------------------+---------------- SET PinitReq|After Created |After Processed |40 ------------+---------------+------------------+---------------- SET PinitRes|After Processed|After Created |60 ------------+---------------+------------------+---------------- SET PReq |After Created |After Processed |80 ------------+---------------+------------------+---------------- SET PRes |After Processed|After Created |100 ------------+---------------+------------------+----------------
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Note: According to the SET Initiation, PercentComplete should be set "20" at the timing of 1st SET Initiation Response is created/processed because number of its message is variable.
This is defined as an error which is NOT specified in [SET EIG] nor [SET]. IOTP Level Errors are divided into two types according to the following:
OAC Level Error: Error in the OAC. This error is defined in the [IOTP].
SET Related Module Level Error: Error generated in by process on the SET Related Module, not specified in [SET EIG] nor [SET]. For example, when checking the consistency between SET and IOTP elements on SET Related Module, an error might be returned to OAC.
(2) SET Level Error
This is defined as an error which is specified in [SET EIG] or [SET]. SET Level Errors have been divided into two types of error according to following:
SET Technical Level Error: Error in the SET Related Module. This error is defined in [SET] or [SET EIG]. SET Technical Level Errors are further subdivided into two types of errors:
(a) SET Initiation Error Error while the SET Initiation Process is in progress.
(b) SET Transaction Error Error when the SET Transaction (SET PInitReq message, SET PReq message, etc.) is in progress.
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SET Business Level Error: Error when a business error (e.g., an authorization failure) occurs while the SET Transaction is being processed. In SET, Business Level Errors will be returned in the SET PRes message. SET does not use a SET Error Message for this type of error. However, it is necessary to present the OAC with what kind of SET Business Error has occurred.
In this below, the details of each errors above are described.
When OAC Level Errors have occurred, if necessary, the sender and receiver must issue ChangeProcessState API and change the status. For the detail of these errors, see [IOTP].
This is the error generated in a process on the SET Related Module, not specified in [SET EIG] nor [SET]. For example, when checking the inconsistency between SET and IOTP elements on SET Related Module, it might cause an error. This error should be notified to OAC.
In this case, as a response message, Payment Scheme Data is not returned. An appropriate information must be set to Status Response.
o Error generated in SET Initiation Response Message.
(1) SET Initiation Message Error
[SET EIG] describes the error handling when a problem rises in SET Initiation Message. So the Consumer will do the same error handling in 9.4.2.
When SET Initiation Error rises in 1st Initiation Message, an error message will be returned to the Merchant. If an error occurs after 2nd Initiation Message, an error message will be returned to the Payment Handler. SET Initiation Response will be generated having SET-Error-Field in Response Message Header and will be returned ErrorCode as "PayEncapError" and Severity as "HardError".
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(a) SET Initiation Response Error
In SET EIG, there is no description about the handling on the problems in SET Initiation Response. However, it is necessary to define some handling for the problems in SET/IOTP
(b) Process of Payment Handler
When a problem rises in SET Initiation Response, SET Related Module generates ErrorResponse, which is included the "EnCapProtoErr" as ErrorCode and the "HardError" as Severity. But PaySchemePackagedContent is not included in this API.
(2) Process of Consumer
ChangeProcessState API must be issued, and ProcessState must be modified.
When a SET Transaction Error rises, SET Core creates SET Error Message. Then the SET Related Module creates ErrorResponse Message which includes "HardError" as Severity, "EnCapProtoErr" as ErrorCode and PaySchemePackagedContent. The SET Bridge passes the ErrorResponse Message to OAC. OAC will generate an Error Block which includes PaySchemePackagedContent and sends it to the Receiver side.
(2) Process of Receiver
With ContinueProcess API, receiver's OAC sends the message including the PaySchemeData to SET Bridge. SET Bridge passes the SET Error Message to SET Core for this process. After that, SET Bridge sends "End" status with ContinueProcessResponse API.
SET Related Module checks the SET Business Error in StatusCode in SET PRes message. When SET Transaction Error occurs, SET Related Module creates ErrorResponse Message which is included SET PRes as PaySchemePackagedContent and ErrorCode as "BusinessError" and returns it to OAC. OAC creates Payment Response Block after gets the SET scheme specific receipt in InquireProcessState/Response, and sends it to the Consumer.
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(2) Process of Consumer
SET Related Module conducts the same process as in the process that Consumer receives Payment Response Block.
In the IOTP, Merchant and Payment Handler may exist in different domains. So, if the Merchant passes the payment related information to the Payment Handler via the Consumer, the payment security level may depend on the IOTP. If you want to avoid this, you will need to check integrity of these data by using out-of-band communication between the Merchant and the Payment Handler. In this case, the security level depends on the communication path between them.
The following books provide essential background material. Readers are strongly encouraged to consult these references for more information.
[BASE64] Base64 Content-Transfer-Encoding. A method of transporting binary data defined by MIME. See: RFC 2045: Multipurpose Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies. N. Freed & N.Borenstein. November 1996.
[RFC 2801] Burdett, D., "Internet Open Trading Protocol - IOTP, Version 1.0", RFC 2081, April 2000.
[SET] SET Secure Electronic Transaction (TM) , Version 1.0, May 31, 1997 Book 1: Business Description Book 2: Programmer's Guide Book 3: Formal Protocol Definition
[SET EIG] External Interface Guide to SET Secure Electronic Transaction, Sep 24, 1997.
[SJR] "SET Secure Electronic Transaction Specification" Support for Japanese Requirements, Mar 16, 1998.
[IOTP Payment API] Hans, W., et al., "Payment API for v1.0 Internet Open Trading Protocol (IOTP)", Work in Progress.
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[ISO4217] ISO 4217: Codes for the Representation of Currencies. Available from ANSI or ISO.
This document does not ask for any action from IANA. It references an existing registry, iotp-codes, where at the time of publication of this RFC the following BrandID's are registered:
The author of this document appreciates the following contributors to this protocol (in alphabetic order of company) without which it could not have been developed.
Andrew Drapp Hitachi Europe, Ltd.
David Burdett Commerce One (ex. Mondex International)
Copyright (C) The Internet Society (2003). All Rights Reserved.
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Acknowledgement
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