ReferenceData, a unique ID received from the gateway when a transaction is declined. The referenceData links the original FlexPay payment attempt to the subsequent transaction.
How it works
When a transaction declines, FlexPay sends the payment decline details - next retry date, with the referenceData - to the client, which the client receives and stores in their CRM. When sending the retry transaction back to be recovered, the referenceData MUST be submitted to tie the payment to the previous transaction.
Each declined transaction will output a referenceData that must be returned with the very next attempt.