transactionSource method Null safety
Implementation
Map<String, dynamic> transactionSource(double amount, String naration)=>{
'AccountNumber': baseAccountNo,
'Amount': amount,
'TransactionCurrency': currency,
'Narration': naration
};
Map<String, dynamic> transactionSource(double amount, String naration)=>{
'AccountNumber': baseAccountNo,
'Amount': amount,
'TransactionCurrency': currency,
'Narration': naration
};