What: Return information about the Original Transaction Encoded Key when getting details of a Reversal Transaction (Adjustment transaction) with a GET loans Transactions API call.
Why: In order to allow to quickly and easily identify the transaction that was reversed by looking at the details of the reversal transaction itself.
For example, in case a withdrawal transaction from an ATM is reversed (via APIs and integration layer), the original transaction ID/ encoded key is needed for integrity checks. Other examples would be when a disbursement transaction made into a deposit account is reversed, or even a simple penalty applied transaction - the process to identify the original transactions is complicated and requires additional searches to be done "the other way round" i.e. by matching the reversal transaction encoded key stored in the original transaction details.