docs: public ApiResponse<Void> deleteCharactersCharacterIdMailMailIdWithHttpInfo(Integer characterId, Integer mailId,
              String datasource, String token) throws ApiException {
          com.squareup.okhttp.Call call = deleteCharactersCharacterIdMailMailIdValidateBeforeCall(characterId, mailId,
                  datasource, token, null);
          return apiClient.execute(call);
      }