How to get a copy of the remittance advice that was sent to the supplier?

We need to have a copy of the remittance advice that was sent to the supplier. We have checked everywhere and oracle support said to add the email address after the supplier's email address in the supplier site setup separated by a comma. The business does not want this solutin because that means updating all our supplier site and appending the email address that should receive the copy of the remittance advice.

I want to know how does the other company address this requirement? Any idea is very much appreciated.