CSocServOAuthTransport::getStorageTokens

protected function getStorageTokens()
{
	$accessToken = '';
	if($this->userId > 0)
	{
		$dbSocservUser = BitrixSocialservicesUserTable::getList([
			'filter' => [
				'=USER_ID' => $this->userId,
				"=EXTERNAL_AUTH_ID" => static::SERVICE_ID
			],
			'select' => ["USER_ID", "XML_ID", "OATOKEN", "OATOKEN_EXPIRES", "REFRESH_TOKEN", "PERMISSIONS"]
		]);

		$accessToken = $dbSocservUser->fetch();
	}
	return $accessToken;
}