internalTransactionId - a unique transaction ID now generated by GoCardless

In addition to the transactionId provided by most banks, GoCardless now generates a unique ID for each transaction. The data point is called internalTransactionId and is returned on the GET​/api​/v2​/accounts​/{id}​/transactions​/ endpoint.

These IDs are unique within the scope of one bank account (based on GoCardless account_id), meaning that they are not globally unique across the many bank accounts you might be accessing via GoCardless.

Note the difference between transactionId, which is provided by most (but not all) banks and can vary wildly between institutions, and internalTransactionId, which is consistent across all of GoCardless Open Banking coverage:

{
"transactionId": "2022102000494539-1", <--- Bank-generated original ID
"bookingDate": "2022-10-20",
"valueDate": "2022-10-20",
"transactionAmount": {
  "amount": "-5.50",
  "currency": "EUR"
},
"remittanceInformationUnstructured": "bla bla (222095) Kafejnica Sala-VEF 2 LV-1039 Riga",
"bankTransactionCode": "PMNT",
"internalTransactionId": "d8f93e27c3fd639e111f95fd49647fc7" <-- GoCardless-generated ID
},

Be aware that internalTransactionId is generated only for booked transactions and not for the pending ones.

If you need unique identifiers across all connected accounts please use: account_id+internalTransactionId

This feature is implemented for all banks across our coverage.