toJson method
Implementation
Map<String, dynamic> toJson() => {
'transactionType': transactionType,
'billingKey': billingKey,
if (billingIssueToken != null) 'billingIssueToken': billingIssueToken!,
if (code != null) 'code': code!,
if (message != null) 'message': message!,
if (pgCode != null) 'pgCode': pgCode!,
if (pgMessage != null) 'pgMessage': pgMessage!,
};