How to perform a full payment of a prepayment via api?

Hi,

we are using the ap invoice interface to import ap invoices. at the end of the automatic process the invoice is validated and the wf approval process is initiated.

we need to include a full payment in this automatic process. meaning: the prepayment invoice need to be fully paid and available for applying immediately after the validation. no user need to perform the full payment.

the payment is done by check or cash, so I need to to supply the payment type and reference to the api.

did anyone use the full payment api?

any help on this will be appreciated.