code: public function sendContact($peer, $phoneNumber, $firstName, $lastName)
      {
          $peer        = $this->escapePeer($peer);
          $phoneNumber = $this->formatPhoneNumber($phoneNumber);
          $firstName   = $this->escapeStringArgument($firstName);
          $lastName    = $this->escapeStringArgument($lastName);
  
          return $this->exec('send_contact  ' . $peer . ' ' . $phoneNumber . ' ' . $firstName . ' ' . $lastName);
      }
docs: Sends contact to $peer (not necessary telegram user)
  @param string $peer
  @param string $phoneNumber in format
  @param string $firstName
  @param string $lastName
  @return mixed