toJson method

Implementation

@override
Map<String, dynamic> toJson() {
  final json = super.toJson();
  addWhenNotNull(json, "nftoken_taxon", nftokenTaxon);
  addWhenNotNull(json, "issuer", issuer);
  addWhenNotNull(json, "transfer_fee", transferFee);
  addWhenNotNull(json, "uri", uri);
  return json;
}