With customer accounts you can allow you customer to add credit to their account at any time, with any payment method that you accept. Before you can add credit to a customer’s account, you will need to make sure that you have customers created in your system, and a pending payment (Charge Account) payment method created.
To add the credit, tap on the Customer button at the top of the screen. Select the customer from the list and tap Accept. If the customer is also buying some items, you can add those to the sale, if not, add a $0 item and then press the payment button ( ) to go to the payment screen. On the payment screen, enter the money that the customer is adding to their account, and then tap on your Charge Account payment method.
Tap the Finish button at the top of the page to complete the transaction.