code: public com.squareup.okhttp.Call postCharactersAffiliationAsync(List<Integer> requestBody, String datasource,
              final ApiCallback<List<CharacterAffiliationResponse>> callback) throws ApiException {
  
          com.squareup.okhttp.Call call = postCharactersAffiliationValidateBeforeCall(requestBody, datasource, callback);
          Type localVarReturnType = new TypeToken<List<CharacterAffiliationResponse>>() {
          }.getType();
          apiClient.executeAsync(call, localVarReturnType, callback);
          return call;
      }
docs: Character affiliation (asynchronously) 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)
  @param callback
  The callback to be executed when the API call finishes
  @return The request call
  @throws ApiException
  If fail to process the API call, e.g. serializing the request
  body object