Purchase event has dynamic parameters which usually require plugins. How do I do it for wix?
There’s a few ways to setup GA4 on Wix and depends on your specific needs.
The first is no-code, using the out of the box integration. The steps for it are here - Tracking Events on Your Wix Site with a Google Analytics Measurement ID | Help Center | Wix.com
The other way is via code, where you can track events based on the specific triggers you define - Track Event | SDK