public function getRegistrationLink($program_id, $session_id) {
    $uri = $this->getUrlFromOpenyProgramsSearchSettings('registration_path');

    $query = [
      'program_id' => $program_id,
      'session_ids' => $session_id,
    ];

    $path = Url::fromUri(
      $uri,
      [
        'query' => $query,
        'absolute' => TRUE,
        'https' => TRUE,
      ]
    );

    return $path->toString();
  }