code: protected function apiSend(Slice $slice, callable $callback)
      {
          try
          {
              return $this->apiRequest($slice);
          }
          catch (\Throwable $throwable)
          {
              return $this->apiRequest($callback());
          }
      }
docs: @param Slice    $slice
  @param callable $callback
  
  @return Slice|null