Phil from the Shopify Support team here. Let me give you some insight on this.
You can set up conversion travcking for sucessfull orders with tools like Google AdWords and Facebook tracking pixel. Have a look at some of their documentation which I've linked for you below:
Set up conversion tracking with Google AdWords - Learn more here
Conversion Measurement with Facebook - Learn more here
With these tools you'll be able to set up tracking pixels to help you get the information you're looking for. There's a 'Additional contents and scrips' area where you need to enter those scripts into in your checkout. That is found in Settings > Checkout section of your admin. We have documentation for you that outlines how to do this: https://help.shopify.com/themes/customization/order-status/add-conversion-tracking-to-thank-you-page
This should get you started in the right direction!
Customer Success Guru