toJson method
Implementation
Map<String, dynamic> toJson() {
final json = <String, dynamic>{};
json['amount'] = amount;
json['created_at'] = createdAt.toIso8601String();
if (customerId != null) {
json['customer_id'] = customerId;
}
json['customer_name'] = customerName;
json['due_date'] = dueDate.toIso8601String();
if (id != null) {
json['id'] = id;
}
json['issue_date'] = issueDate.toIso8601String();
json['reference_number'] = referenceNumber;
json['units_consumed'] = unitsConsumed;
json['updated_at'] = updatedAt.toIso8601String();
return json;
}