There are two possible options here: If you have entered the wrong amount and have not tapped the customers’ card yet, you can easily click the button in the upper left corner on the screen that is pending for the customer to “Present card” and then start a new transaction.

If you have entered the wrong amount and have already tapped the customers’ card, wait the transaction to finish. Go into your “Transactions” menu and find the wrong amount transaction. Click on it and then choose the “Void” button. On the next screen you will be asked to confirm the void. Once it is successful, you can go back and make a new transaction with the right amount.