After pressing the END SALE button in POS you are taken to the payment screen.
You will have some preset payment methods but you can add your own.
Step 1: Find the New Payment Method input. NOTE: You must have permission to access this. If you don’t, you’ll need to log in with a user that does.
Step 2: Enter the name of the new payment type and press the + Button.
You will see the new payment type in the list and it can instantly be used.