Added the serialNumber field to voucher payouts in the responses from Retrieve Payout Status and Callback Payout. This is accomplished by introducing a new schema in payoutDetails (data -> payments -> paymentDetails) specifically for voucher support.
Added the new fields serialNumber and pin for voucher support in orders in the Retrieve Order Details endpoint and Callback, via a new schema in paymentDetails.
Expanded the paymentSystem enum within the paymentDetails object to include maestro: