Is there a process in AR to pay off from one customer account another customer's open AR invoice?

Dear Oracle AR Guru:

We have a request from our business to have a capability in our Oracle AR application paying off from our one customer account (on account) to another AR customer's that has open invoice.

Here is an example:

1. Customer A comes in to Oracle AR with $50.00 payment. This $50.00 payment will sit on customer A's account. Note: We'll open a DFF to store their source payment code (i.e. coupon #)

   2. Customer B comes in to Oracle AR with $50.00 open invoice. Note: This customer may have other invoice line(s) on the same invoice. However, Customer B will have an Invoice line with $50.00 amount Note: we'll Open DFF for this invoice line to capture the Customer A's payment code (i.e. coupon#)