code: public function renewItem($user_id, $item_id)
  	{
  		$request = new RenewRequest($user_id, $item_id);
  		$this->emit('request.renew', array($user_id, $item_id));
  		$response = $this->post($request);
  		return new RenewResponse($response);
  	}
docs: Renew an item for a user
  
  @param  string  $user_id
  @param  string  $item_id
  @return RenewResponse