How to have a single gateway sending AR invoices for multiple customers

Summary:

We send all invoices electronically to the same vendor and that vendor is then responsible for delivering the invoices to the customers. This is just like payments, that you send all payments to your bank and your bank sends your payments further.

We are not able to effectively manage this in Oracle. As a trading partner can only be associated with one customer we are forced to create multiple trading partners, one for each customer. Is there a way around for this?

Version (include the version you are using, if applicable):

25D.

Code Snippet (add any code snippets that support your topic, if applicable):