Shopify Checkout Extensibility Can Break Meta CAPI Event ID Deduplication
When merchants migrate to Shopify’s Checkout Extensibility, the old checkout.liquid script‑based tracking is replaced by the sandboxed Web Pixels API. This shift can silently break the event_id stitching needed for Meta Conversions API deduplication, leading to double‑counted or missing conversions. Verify event_id matching in Facebook Events Manager after the upgrade.