Verification + debugging

Put the code from Events Manager → Test events into Test event code (Configure) and save.
Browse your store in another tab: view a product, add to cart, check out.
Events show in Test events with their details. Server-side purchases are marked as coming from the server.
Clear the test code afterwards.

Meta's free Meta Pixel Helper extension for Chrome shows which pixel events fired on each page.

No events at all — Pixel ID missing or wrong, module off, or Cookie Consent blocking until you accept.
Only server Purchases, no browser events — an ad blocker in your browser; try a private window without extensions.
Two Purchases per order in reports — usually settles once Meta matches them; give it a day.