Payment Refunds (QBO)

[hhelmric]

I'm trying to understand how to work with Codat to issue a refund for a payment (in the context of QBO).

The Codat documentation here states that

If a payment is refunded, for example, if a customer overpaid an invoice and the overpayment is returned to the customer, there are two payment records:

One for the incoming over payment.
Another for the outgoing refund.

It goes on to imply that the payment issuing the refund has 1 payment line (negative amount, payment type of Payment, referencing the originating payment)

However it also implies the the originating payment should have multiple payment lines (which would include the Refund type)

For QBO, the Data Coverage Explorer shows that updating payments with QBO is not yet supported.

I've tried several things and if I try to push a single Payment to attempt a refund for a previously-pushed Payment, I am getting a validation error message of: "could not find linked transaction type associated to provided transaction payment type ."

If the originating payment (ie the original overpayment of an invoice) was already pushed to QBO, and if payment update operations are not supported, how can we properly document a refund for a payment made to an invoice?