4b: Multi-Party Commerce or OTA (MasterCard) {#pa-3ri-4b-test-multi-party-commerce-ota-mc}
==========================================================================================

In this test case, a travel booking merchant creates a multi-party transaction for the cardholder. The merchants participating in the multi-party transaction are required to authorize on flights, hotels, and car rentals etc. This test case focuses on what the participating merchants are required to send for a successful transaction. Note that each participating merchant must send their own CAVV.

|       **Card Type**        | **Test Card Number** |
|----------------------------|----------------------|
| Mastercard Card Type = 002 | 52XXXX XX XXXX 28X5  |

Endpoint
--------

Set the `payerAuthSetupService_run` field to `true`.  
Send the request to:  
**Production:** `https://ics2ws.ic3.com/commerce/1.x/transactionProcessor`  
**Test:** `https://ics2wstest.ic3.com/commerce/1.x/transactionProcessor`

Required Fields for 3RI 4b: Multi-Party Commerce or OTA (MasterCard) {#pa-3ri-4b-test-multi-party-commerce-ota-mc-req}
======================================================================================================================

Required Fields
---------------

[payerAuthEnrollService_ authenticationIndicator](https://developer.cybersource.com/docs/cybs/en-us/api-fields/reference/all/so/api-fields/payer-auth-enroll-service-auth-indicator.md "")
:
Set this field value to `85`.

[payerAuthEnrollService_challengeCode](https://developer.cybersource.com/docs/cybs/en-us/api-fields/reference/all/so/api-fields/payer-auth-enroll-service-challenge-code.md "")
:
Set this field value to `03`.

[payerAuthEnrollService_deviceChannel](https://developer.cybersource.com/docs/cybs/en-us/api-fields/reference/all/so/api-fields/payer-auth-enroll-service-device-channel.md "")
:
Set this field value to `Browser`.

[payerAuthEnrollService_ installmentTotalCount](https://developer.cybersource.com/docs/cybs/en-us/api-fields/reference/all/so/api-fields/payer-auth-enroll-service-installment-count.md "")
:

[payerAuthEnrollService_messageCategory](https://developer.cybersource.com/docs/cybs/en-us/api-fields/reference/all/so/api-fields/payer-auth-enroll-service-message-category.md "")
:
Set this field value to `01`.

[payerAuthEnrollService_recurringEndDate](https://developer.cybersource.com/docs/cybs/en-us/api-fields/reference/all/so/api-fields/payer-auth-enroll-service-recurring-end-date.md "")
:

[payerAuthEnrollService_recurringFrequency](https://developer.cybersource.com/docs/cybs/en-us/api-fields/reference/all/so/api-fields/payer-auth-enroll-service-recurring-frequency.md "")
:

[payerAuthEnrollService_ recurringOriginalPurchaseDate](https://developer.cybersource.com/docs/cybs/en-us/api-fields/reference/all/so/api-fields/payer-auth-enroll-service-recurring-orig-purch-dat.md "")
:

[payerAuthEnrollService_ requestorInitiatedAuthenticationIndicator](https://developer.cybersource.com/docs/cybs/en-us/api-fields/reference/all/so/api-fields/payer-auth-enroll-service-requestor-initiated-auth.md "")
:

payerAuthEnrollService_sequenceNumber
: