code: public function getUser(IncomingMessage $matchingMessage)
      {
          $sender_id = $matchingMessage->getRecipient();
  
          $user = Collection::make($this->payload->get('users'))->first(function ($user) use ($sender_id) {
              return $user['id'] === $sender_id;
          });
  
          return new User($user['id'], null, null, $user['name'], $user);
      }
docs: Retrieve User information.
  @param \BotMan\BotMan\Messages\Incoming\IncomingMessage $matchingMessage
  @return User