toJson method
Implementation
Map<String, dynamic> toJson() {
var map = <String, dynamic>{};
map['date'] = _date;
map['interestRate'] = _interestRate;
map['monthlyInstallment'] = _monthlyInstallment;
map['principalReduction'] = _principalReduction;
map['interest'] = _interest;
map['remainingPrincipal'] = _remainingPrincipal;
return map;
}