transactionReason {#transaction-reason}
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Transaction reason code. Sends the reason code as 5120, which indicates the sales tax/value added tax part of original credit transactions (OCTs).  
This field is available only on the `Visa Platform Connect` processor.
To process Faster Refund Original Credit Transactions (OCTs) in AP and the EU, include these fields in the request:

* Transaction Type
  * Record: Field 3
  * Positions: 1-2
* Transaction Amount
  * Record: Field 4
* Card Acceptor Name or Location
  * Record: Field 43
* Transaction Identifier
  * Record: Field 62.2 (in bitmap format)
* Message Reason Code
  * Record: Field 63.3
* Acceptor Legal Business Name
  * Record: 104, Usage 2---Transaction-Specific Data (in TLV format)
  * Dataset ID: 56
  * Tag: 81
* Business Application Identifier (BAI)
  * Record: 104, Usage 2---Transaction-Specific Data (in TLV format)
  * Dataset ID: 57
  * Tag: 01
* Visa Merchant Identifier
  * Record: 126.5

Specifications {#transaction-reason_d1100e110}
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* **Data Type:** String
* **Data Length:** 4

Mapping Information {#transaction-reason_d1100e129}
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* **REST API Field:** processingInformation.transactionReason
* **SCMP API Field:** transaction_reason
* **Simple Order API Field:** transactionReason