public function sendMessage($userIds, $text, $pinId = null)
    {
        return $this->send($pinId, $text, $userIds, []);
    }
public function sendMessage($userIds, $text, $pinId = null)
    {
        return $this->send($pinId, $text, $userIds, []);
    }
public function sendMessage ( $ userIds , $ text , $ pinId = null ) { return $ this -> send ( $ pinId , $ text , $ userIds , [ ] ) ; }
Send message to a user.

@param array|string $userIds
@param string $text
@param int|null $pinId
@return bool
@throws InvalidRequest
Send message to a user .