toJson method
Implementation
Map<String, dynamic> toJson() {
var map = <String, dynamic>{};
map['loanBalance'] = _loanBalance;
map['interestRate'] = _interestRate;
map['monthlyPayment'] = _monthlyPayment;
map['extraPayment'] = _extraPayment;
map['isRecurring'] = _isRecurring;
return map;
}