issuingCountryToJson function
Implementation
String? issuingCountryToJson(enums.IssuingCountry? issuingCountry) {
  return enums.$IssuingCountryMap[issuingCountry];
}String? issuingCountryToJson(enums.IssuingCountry? issuingCountry) {
  return enums.$IssuingCountryMap[issuingCountry];
}