connecting Google sheet to Bitrix24 using apps script

Have a www.bitrix24.com login and want to fetch deals, leads and other data from bitrix24 in my google sheets to process as required using REST API. This is bitrix documentation for connecting REST API (https://training.bitrix24.com/rest_help/oauth/authentication.php). So the object will be to create a Google Apps Script which will connect to bitrix24.com using REST API & fetch CRM data like deals leads etc.