// Minimal parameter set
TlvTree paymentParams = TlvTree.Empty();
paymentParams.AddEnum(ArkosTags.SelectedService, PaymentServiceID.Refund);
// Amounts are in BCD. In most cases, all 3 amounts should be the same value.
paymentParams.AddBin(ArkosTags.TransactionAmount, new byte[] { 0x00, 0x00, 0x00, 0x00, 0x10, 0x00 });
paymentParams.AddBin(ArkosTags.AmountAuthorised, new byte[] { 0x00, 0x00, 0x00, 0x00, 0x10, 0x00 });
paymentParams.AddBin(ArkosTags.TransactionAmountBeforeAdjustment, new byte[] { 0x00, 0x00, 0x00, 0x00, 0x10, 0x00 });
// The system needs to provide the Date and Time of this transaction, and the local TimeZone
Calendar cal = Calendar.getInstance();
int utcOffsetMinutes = cal.getTimeZone().getOffset(cal.getTimeInMillis()) / 1000 / 60;
byte[] utcOffset = new byte[2];
utcOffset[0] = (byte) (utcOffsetMinutes / 60);
utcOffset[1] = (byte) (utcOffsetMinutes % 60);
paymentParams.AddEMVDate(ArkosTags.TransactionDate, cal.get(Calendar.YEAR) % 100, cal.get(Calendar.MONTH) + 1, cal.get(Calendar.DAY_OF_MONTH));
paymentParams.AddEMVTime(ArkosTags.TransactionTime, cal.get(Calendar.HOUR), cal.get(Calendar.MINUTE), cal.get(Calendar.SECOND));
paymentParams.AddBin(ArkosTags.LocalTimezone, utcOffset);
paymentParams.AddAscii(ArkosTags.SelectedLanguage, "en");
//Adding an original transaction with the reference data as a child of payment params
TlvTree originalTransaction = paymentParams.AddChild(ArkosTags.OriginalTransaction);
originalTransaction.AddEnum(ArkosTags.SelectedService, PaymentServiceID.Payment);
originalTransaction.AddEMVDate(ArkosTags.TransactionDate, cal.get(Calendar.YEAR) % 100, cal.get(Calendar.MONTH) + 1, cal.get(Calendar.DAY_OF_MONTH));
originalTransaction.AddEMVTime(ArkosTags.TransactionTime, cal.get(Calendar.HOUR), cal.get(Calendar.MINUTE), cal.get(Calendar.SECOND));
originalTransaction.AddBin(ArkosTags.LocalTimezone, utcOffset);
originalTransaction.AddAscii(ArkosTags.RefundReferenceData,"1234567890");
// Call to the doPayment API, sending the Arkos configuration, and parameters as a byte Array
PaymentResult result = arkos.doPayment(configuration, paymentParams.AsBytes());
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