curl -X POST 'baseUrl' -d '{"SaleToPOIRequest":{"MessageHeader":{"ProtocolVersion":"3.0","MessageClass":"Service","MessageCategory":"Payment","MessageType":"Request","SaleID":"saleId","ServiceID":"serviceId","POIID":"poiId"},"PaymentRequest":{"SaleData":{"SaleTransactionID":{"TransactionID":"$timestamp","TimeStamp":"$isoTimestamp"},"SaleReferenceID":"$timestamp"},"PaymentTransaction":{"AmountsReq":{"Currency":"currency","RequestedAmount":30}},"PaymentData":{"PaymentType":"Refund","PaymentInstrumentData":{"PaymentInstrumentType":"StoredValue","StoredValueAccountID":{"StoredValueAccountType":"GiftCard","StoredValueProvider":"givex","IdentificationType":"PAN","EntryMode":["MagStripe"],"StoredValueID":""}}}}}}'