Note: This feature is only available on iOS.
Enter a custom amount by using the keypad where you can also add a note and take a photo of the item you are selling. Or if you've set up items previously you can access your product library by swiping from right to left. Once in your library, you can add items to your check out. If you're ready to process a transaction, tap the amount located at the top of the app (pictured below).
From there tap Invoice then Confirm Payment (pictured below).
Once the transaction has been authenticated and approved, the receipt page will appear. From this screen, input your customers preferred receipt delivery method and click New Sale to start a new transaction (pictured below).