docs: public ApiResponse<Void> deleteCharactersCharacterIdMailLabelsLabelIdWithHttpInfo(Integer characterId,
              Integer labelId, String datasource, String token) throws ApiException {
          com.squareup.okhttp.Call call = deleteCharactersCharacterIdMailLabelsLabelIdValidateBeforeCall(characterId,
                  labelId, datasource, token, null);
          return apiClient.execute(call);
      }