Users that prefer to use an external credit card terminal may customize the available payment options on the order settlement screen to enable managers easy access to non-cash gratuity totals.
Verify that the CREDIT CARD payment type is not disabled in Back Office | Settings | Main Settings | Settle Screen
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Select External Credit Card computer next to interface in Back Office | Settings | Credit Cards.
The default settings for credit card types can be modified in Back Office | Settings | Main Settings | All Program Settings by changing the values of Credit Card Button 1, Credit Card Button 2, Credit Card Button 3 and Credit Card Button 4. These values correspond to the four dark gray buttons on the settlement screen, as shown below. Add an asterisk (*) before or after the button name to automatically select the card type when the credit card payment type is selected, for example MASTER CARD*.