docs: public com.squareup.okhttp.Call getUniverseGroupsGroupIdAsync(Integer groupId, String acceptLanguage,
              String datasource, String ifNoneMatch, String language, final ApiCallback<GroupResponse> callback)
              throws ApiException {
  
          com.squareup.okhttp.Call call = getUniverseGroupsGroupIdValidateBeforeCall(groupId, acceptLanguage, datasource,
                  ifNoneMatch, language, callback);
          Type localVarReturnType = new TypeToken<GroupResponse>() {
          }.getType();
          apiClient.executeAsync(call, localVarReturnType, callback);
          return call;
      }