toMap method
Implementation
Map<String, dynamic> toMap() => {
"merchantID": merchantId == null ? null : merchantId,
"uniqueTransactionCode": uniqueTransactionCode == null ? null : uniqueTransactionCode,
"amount": amount == null ? null : amount,
"amountDouble": amountDouble == null ? null : amountDouble,
"desc": desc == null ? null : desc,
};