Every case starts with data that isn't telling the truth.
Different stacks. Different platforms. Same pattern. Platform dashboards report one number, the back-end reports another, and the gap has been there long enough to start affecting decisions. Below are the engagements where closing that gap changed the outcome.
From 1.7 to 8.0 ROAS in 30 days. Without changing a single ad.
A marketing agency was losing 25% of purchase events to ad blockers, concentrated in their highest-value customer segment. Meta reported a 3.0 ROAS, the back-end consistently said 4.0, and the gap had been there for months. Every bidding decision was working from a distorted picture of what was actually driving revenue.
Server-side GTM plus Meta Conversions API closed the loop. Ad platforms started optimising on complete signals, and the campaigns did the rest.
- Server-side GTM deployed on a first-party subdomain the client controls
- Meta Conversions API live alongside the browser pixel with event deduplication
- Data layer rebuilt as one source of truth for GA4, Google Ads and Meta
- Ad blocker losses eliminated at the routing layer, not patched in reporting
More case studies publishing as engagements close. If you want yours on this page, a free tracking audit is where it starts.
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