public ConferenceApi(IConferenceApiEndpoints api)
 {
     _api = api;
 }
 public Conference(IConferenceApiEndpoints api, string conferenceId)
 {
     _api          = api;
     _conferenceId = conferenceId;
 }
 public ConferenceParticipant(IConferenceApiEndpoints api, string conferenceId, string id)
 {
     _api          = api;
     _conferenceId = conferenceId;
     _id           = id;
 }