toJson method

Implementation

@override
Map<String, dynamic> toJson() {
  final json = super.toJson();
  addWhenNotNull(json, "destination", destination);
  addWhenNotNull(json, "send_max", sendMax.toJson());
  addWhenNotNull(json, "destination_tag", destinationTag);
  addWhenNotNull(json, "expiration", expiration);
  addWhenNotNull(json, "invoice_id", invoiceId);
  return json;
}