When the integrated card payment processor is connected and available, You can use the Card method. The process of voiding a card payment using the integrated external terminal is described below. 

The option to Void a card transaction is only available on the same day when the card was charged. Click the “Void” button to initiate the void operation. The void amount is always equal to the payment amount. A payment which was partially refunded cannot be voided. The system will send the payment to be voided to the external terminal. MT-POS will receive the authorization code from the external terminal and record the void in MT-POS. 

       Note: Credit/debit card transactions are always processed in local currency.