toJson method
Converts this class object into a JSON value.
Implementation
@override
Map<String, dynamic> toJson() {
  final result = super.toJson();
  if (as != null) {
    result["ace:as"] = as.toString();
  }
  if (audience != null) {
    result["ace:audience"] = audience;
  }
  if (scopes != null) {
    result["ace:scopes"] = scopes;
  }
  if (cnonce != null) {
    result["ace:cnonce"] = cnonce;
  }
  return result;
}