asMap property Null safety
Implementation
Map<String, dynamic> get asMap =>{
'referenceNumber': referenceNumber,
'accountNumber': accountNumber,
'mobileNumber': mobileNumber,
'phoneNumber': phoneNumber,
'bankCode': bankCode,
'amount': amount,
'transactionCurrency': transactionCurrency,
'narration': narration,
'transactionID': transactionID,
'responseCode': responseCode,
'responseDescription': responseDescription
};