Full Answer

The migration is straightforward because you are replacing the delivery mechanism, not the data or the destinations. GA4 continues receiving events — previously from your GTM server container via tag, now from Transmute Engine via Measurement Protocol API. Facebook continues receiving events — previously from a GTM CAPI tag, now from the Facebook outPIPE connector. The destination platforms see a continuous stream of events with no interruption.

The parallel running period is the safety net. For 48–72 hours, both your Stape-hosted GTM container and Transmute Engine send events to the same destinations. You compare event counts in GA4 real-time, in Facebook Events Manager, and in BigQuery to confirm that Transmute captures everything GTM was capturing — and often more, because server-side hook capture bypasses the ad blocker and consent-mode losses that affect GTM's Data Layer-dependent collection.

After parity is confirmed, you disable the GTM web container tag that forwards events to the server container, decommission the GTM server container in Stape's dashboard, and cancel the hosting subscription. The GTM containers can be archived rather than deleted, preserving the configuration as a reference.

The one consideration is non-ecommerce GTM triggers. If your GTM web container fires scroll tracking, video engagement, or custom click events that Transmute does not replicate, those specific triggers need either a minimal GTM web container or an alternative JavaScript solution. For ecommerce conversion events — the primary use case — the migration is one-to-one.