docs: public com.squareup.okhttp.Call getCharactersCharacterIdContractsAsync(Integer characterId, String datasource,
              String ifNoneMatch, Integer page, String token, final ApiCallback<List<CharacterContractsResponse>> callback)
              throws ApiException {
  
          com.squareup.okhttp.Call call = getCharactersCharacterIdContractsValidateBeforeCall(characterId, datasource,
                  ifNoneMatch, page, token, callback);
          Type localVarReturnType = new TypeToken<List<CharacterContractsResponse>>() {
          }.getType();
          apiClient.executeAsync(call, localVarReturnType, callback);
          return call;
      }