Hey @kiennguyen ,
It's tough to troubleshoot further without looking over your code in depth. However, looking at your previous question, and the shopify-api-node package, is there a chance you're using a version before 2.24.0?
For reference, although you may have switch to using since_id, those unsupported warnings are because your app is sending the page param in certain requests to the Customers and Orders API (e.g. /admin/customers.json?status=any&access_token=[FILTERED]&limit=250&status=any&page=702) which has been deprecated.
If you're able to identify a specific issue with the shopify-api-node package that sends the page param when you believe it shouldn't, we can investigate further.