docs: public com.squareup.okhttp.Call postCharactersCharacterIdFittingsAsync(Integer characterId, String datasource,
              String token, CharacterFitting characterFitting, final ApiCallback<CharacterFittingResponse> callback)
              throws ApiException {
  
          com.squareup.okhttp.Call call = postCharactersCharacterIdFittingsValidateBeforeCall(characterId, datasource,
                  token, characterFitting, callback);
          Type localVarReturnType = new TypeToken<CharacterFittingResponse>() {
          }.getType();
          apiClient.executeAsync(call, localVarReturnType, callback);
          return call;
      }