Works well so far – test with Google Tag Assistant in Chrome

I have installed this plugin and it works well. You can test it using Google Tag Assistant in Chrome. On the left hand side you see the events and in the main panel you can see variable data. I tested a purchase and the correct values were populated.

If your users are from the EU or UK then Google will not actually collect the data unless you have a consent compliant cookie banner plugin. You can read more about this EU inflicted misery on small business owner by searching: Google Site Kit consent mode.