Hi,
We actually talked about this in another thread a few months ago:
www.hikashop.com/forum/integrations/901713-ga4-integration.html
So I would recommend reading there for more details.
In short, while the GA plugin is not compatible with the GA 4 ecommerce API, it still works fine with GA accounts and no modifications are needed.
The GA4 ecommerce API is to track events on the website, not sales, so it's another purpose.
It could be interesting in the future to have an extra GA plugin for it, but it won't help much for the tracking of sales so the plugin we have will still be needed and more useful.