In my country we use Meal Voucher so much because Government and Company give their employees Meal Vouchers every month. They got different type of Voucher books ones got 5 TND each and ones got 6.4 TND etc
When Client step to Pay Ticket he ask of number of voucher he need, example :
Ticket Total : 25 TND
Voucher Amount 5.800 TND
25 / 5.800 => 4.3
You need 4 Vouchers and the reste well be paid in Cash.
I there any way i could add a boutton in payment screen then a pop up show a form i could type Voucher Amount and it calculatE NUMBER OF TICKET costumer need to cut form the book.