Any way to tag people that have paid in full or completed payments for a product?

I would like to automate a process that tags the purchaser’s contact record for products that are Paid In Full. Essentially letting us know if they’ve completed their payments (even if they’ve paid with 1 payment)

There are payment triggers inside your app and also a widget in campaign builder that will allow you to trigger when an order has any payment, is paid in full or a specific product is sold.