I've been looking for an app to let me import customer payment for multiple invoices.

Im only seeing importing invoices with payments.

In my case the invoices are already existing. What I currently do is enter the customer payment and manually match the invoices related to that payment with its Customer Reference.

I need to find a way to import via Excel.  If anyone can point me to an existing app or better yet an existing way that I can do this without one that would be great.