docs: public ApiResponse<Integer> postCharactersCharacterIdMailWithHttpInfo(Integer characterId, String datasource,
              String token, Mail mail) throws ApiException {
          com.squareup.okhttp.Call call = postCharactersCharacterIdMailValidateBeforeCall(characterId, datasource, token,
                  mail, null);
          Type localVarReturnType = new TypeToken<Integer>() {
          }.getType();
          return apiClient.execute(call, localVarReturnType);
      }