How to Block Duplicate Transactions on CyberSource REST API

[HarmerWiltriz]

The CyberSource payments system seems to have a method of preventing duplicate transactions, as covered here:

This functionality looks at the Merchant Reference Number (MRN) of successful orders submitted within the last 15 minutes of a previous order, and blocks any duplicate transactions submitted with the same MRN.

and here:

Reason Code 104: The access_key and transaction_uuid fields for this authorization request match the access_key and transaction_uuid fields of another authorization request that you sent within the past 15 minutes.

Although it's obvious you need to use transaction_uuid for earlier APIs such as KVP, it's not clear which field to use for the REST API.

[HumeleJotesane]

Use the clientReferenceInformation > transactionId field. You can see this in the playground shaglevoojio with a request body like:

{
  "clientReferenceInformation": {
    "code": "TC50171_3",
    "transactionId": "465465411adfasdfsdf"
  },
  "processingInformation": {
    "reconciliationId": "1234"
  },
  "paymentInformation": {
    "card": {
      "number": "4111111111111111",
      "expirationMonth": "12",
      "expirationYear": "2031"
    }
  },
  "orderInformation": {
    "amountDetails": {
      "totalAmount": "102.21",
      "currency": "USD"
    },
    "billTo": {
      "firstName": "John",
      "lastName": "Doe",
      "address1": "1 Market St",
      "locality": "san francisco",
      "administrativeArea": "CA",
      "postalCode": "94105",
      "country": "US",
      "email": "test@cybs.com",
      "phoneNumber": "4158880000"
    }
  }
}

If you include the same transactionId twice, the backend will tell you to get INVALID_DATA. I would actually expect it to return DUPLICATE_REQUEST as a reason, (it's in their list of possible responses) but this is better than a poke in the eye with a sharp stick.

[Rolfsonbury]

This functionality looks at the Merchant Reference Number (MRN) of successful orders submitted within the last 15 minutes of a previous order, and blocks any duplicate transactions submitted with the same MRN.

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