optional, predefined tags. BillingEmail - billing email, TransactionRate - transaction rate, BillingInfo - billing info, TransactionCost - transaction cost, Channel - channel, BillingMobileNumber - billing mobile, TransactionFee - transaction fee, GST - GST (tax), NetAmount - net amount, IPAddress - IP address, BankName - bank name, BIN - card no (hidden), ExpiryDate - card expiry date, StatusDescription - status description, SettlementDate - settlement date, PaidDate - paid date, TerminalID - terminal ID, PayTransactionID - transaction ID, BuyerName - buyer name, CaptureRefID - Capture Reference ID (Only in v3), RefundRefID - Refund Reference ID (Only in v3), AcquirerName - Acquiring bank or processor name (For gateway solution merchant only), CardScheme - Card brand (VISA, MASTERCARD), CardType - Card type (GOLD, PLATINUM), CardCountry - Country name from the user's card, all - for all additional fields, Combine with delimiter "," for multiple fields