toJson method

Implementation

@override
Map<String, dynamic> toJson() {
  final json = super.toJson();
  addWhenNotNull(json, "owner", owner);
  addWhenNotNull(json, "offer_sequence", offerSequence);
  addWhenNotNull(json, "condition", condition);
  addWhenNotNull(json, "fulfillment", fulfillment);
  return json;
}