How do we refund a bank account acquired via Accept.js?

[aschuhardt-origami]

The SDK documentation specifies that you need full bank account information in order to credit a bank account (routing number, account number, etc.).

If we used Accept.js to make the original debit, however, we don't have any of that information stored. Only the original nonce (expired at this point) and transaction ID are available to the developer.

For credit card refunds, only last-4 of the card number is required, and can be acquired via getTransactionDetails. This API method returns masked bank account information, which according to the docs cannot be used for crediting a bank account.

How can I refund ACH transactions when I only have the transaction ID?