Facebook Pixel Not Tracking Purchases on Shopify?

Causes, ranked6 causes

1. 01

   Different destination IDs

   I compare the pixel selected under Facebook & Instagram with the dataset I am inspecting in Events Manager. I write down both privately, then select the intended destination before testing.
2. 02

   Two installations

   I inventory the channel, custom pixels, theme code and any tracking app. I look for two senders before adding another. Two event paths are a reason to investigate, not proof that every order is doubled.
3. 03

   App pixel status or data access

   I open Settings > Customer events and inspect the app pixel. Shopify documents that Optimized data access can pause some or all marketing-pixel data when it detects oversharing. This is separate from the channel’s Standard, Enhanced or Maximum setting.
4. 04

   Domain or store mismatch

   I record the domain used for the checkout and compare it with the store and destination under inspection. I check any domain warning that the account actually displays rather than assuming domain verification explains every missing Purchase.
5. 05

   Consent

   I test the banner’s accepted and declined paths separately. Shopify Pixel Helper can report that a pixel is awaiting consent. I preserve that distinction when comparing with Events Manager.
6. 06

   Checkout completion never reaches the browser pixel

   I test the payment route that loses orders, including a return from an external payment app. Shopify says checkout_completed normally fires on the Thank you page, or on the first post-purchase offer page. It does not fire if its trigger page fails to load. This describes the browser event, not every server integration.