AP: Supplier payment through credit card

This is an Oracle 11i Accounts Payable related question. We use Oracle 11.5.10 and there's a need from our business to set up paygroup so we can use Amex credit card to supplier payments.

Normal AP payments would create accounting entries as below:

Invoice: Debit charge acct
             Credit A/P liability
        

Upon Payment
            Debit A/P Liability
           Credit Cash clearing account

However, for payment using Amex credit card, we would like to have accounting entries createrd like this:

Invoice: Debit charge
             Credit A/P liability

Paid by Amex card:
           Debit A/P Liability
           Credit Amex Liability

Paid Amex bill via check