Is it possible in the app to create a "fixed-value voucher" as payment method.

We distribute €1.80 vouchers. People can use these vouchers (as many as they like) to pay, but no change is given when the total voucher value exceeds the bill amount.

For example, Bill = €5.00
- customer can pay with 3 vouchers (total value €5.40), no change is given.
- customer can pay with 2 vouchers (total value €3.60) + any amount in cash, then change is given.