Sage Accounting US

Is there a way to set up my invoicing to automatically apply the Customer's account credit to their invoice? This would be SO HELPFUL, instead of having to create the invoice, then go and receive the credit against it, then reprint the credited invoice…

Hello, I am trying to integrate Sage into a clients application. I was following along with the setup guide for Sage accounting. I created all the profiles necessary but when I go to authenticate through postman into a created app I get a auth error and…