code: public List<CharacterAffiliationResponse> postCharactersAffiliation(List<Integer> requestBody, String datasource)
              throws ApiException {
          ApiResponse<List<CharacterAffiliationResponse>> resp = postCharactersAffiliationWithHttpInfo(requestBody,
                  datasource);
          return resp.getData();
      }
docs: Character affiliation Bulk lookup of character IDs to corporation,
  alliance and faction --- This route is cached for up to 3600 seconds
  
  @param requestBody
  The character IDs to fetch affiliations for. All characters
  must exist, or none will be returned (required)
  @param datasource
  The server name you would like data from (optional, default to
  tranquility)
  @return List&lt;CharacterAffiliationResponse&gt;
  @throws ApiException
  If fail to call the API, e.g. server error or cannot
  deserialize the response body