toJson method
Implementation
Map<String, dynamic> toJson() => <String, dynamic>{
"terminalId": terminalId,
"merchantId": merchantId,
if (centerTerminalId != null) "centerTerminalId": centerTerminalId,
if (merchantName != null) "merchantName": merchantName,
if (merchantPostalCode != null) "merchantPostalCode": merchantPostalCode,
if (merchantPhone != null) "merchantPhone": merchantPhone,
};