Recently we had an issue where a merchant (we act as a service provider) had already refunded a transaction via the merchant portal then when attempting to refund it through our service we encountered error code 55.
We had no other way to determine if the transaction was refunded/settled other than walking our way back through settled batches closed after the initial capture's date (or calling A.net support).
So, my proposal is this: add an array of refund transaction IDs (complete/partial) to the `getTransactionDetailsRequest` response
