Adding new payments:
1. In the upper right click on the “+ Add Payment” icon
That will open up a payment section on the right side of the screen.
-There you can select a customer.
-Bellow you can select which invoice for that customer you want to process a payment on.
-Only invoices with open balances will be displayed.
The other way to do it is :
1.Go to Invoices
2.Select the invoice you want to add a payment on
3.Click on Add Payment and fill in the amount and Payment method
-You also have an Internal payment note which the customer can’t see