Open https://tagmanager.google.com, log into your Google Tag Manager account, choose the GTM that you have integrated with the All in One Pixel Manager and then click Preview (Refer Screenshot 2.1)
Enter the website URL here (Refer screenshot 2.2)
Step 3 :
Once connected, perform any action you would like to test in your debugging window.
Note :The events are being fired after I took the action of visiting the product detail page (Refer screenshot 2.3).
Step 4 :
In the debugging window, I made a purchase, and you can see that the purchase events were triggered appropriately (Refer screenshot 2.4)