Case study · E-commerce · Tracking & Attribution
Rebuilding the conversion tracking foundation for a scaling DTC subscription brand
9.3 / 10
Purchase EMQ, up from near zero
Daily
Conversions recovered by the server pipeline
CAPI
All purchases flow through Conversions API
First-party
Tracking infrastructure owned end to end
About the client
Why Brands With This Problem Talk to OST
Tracking failures in DTC ecommerce are rarely a single bug. They are usually three or four overlapping failures hiding each other: iOS opt-outs, a partially built server pipeline, paused tags from a prior vendor, and third-party tools contaminating the signal. Diagnosing the actual gap requires deep working knowledge across half a dozen platforms and the application layer they sit on.
OST builds and operates this infrastructure as a core practice. If your ad dashboards do not match your backend, if your match quality scores are stuck, or if your prior vendor's pipeline is half-built and unowned, this is the kind of engagement we run end to end.
The Challenge
A tracking stack with three failure modes layered on top of each other.
The brand was scaling paid social on a tracking foundation that was compounding errors silently. iOS App Tracking Transparency was blocking pixel events on mobile. A server-side pipeline had been partially built by a prior vendor but never connected, and key Meta tags inside Google Tag Manager were paused. A third-party plugin was sending its own purchase events to Meta on every order, including subscription renewals, training the algorithm on the wrong audience.
The result was an attribution layer the brand could not trust. Ad dashboards did not match the backend. Match quality scores were stuck near zero. Ad budget was being optimized against the wrong signal. The stack needed to be rebuilt, not patched.
The Solution
A complete rebuild executed across browser, server, and application layers.
OST took ownership of the full tracking layer, audited every component touching event flow, and rebuilt the foundation so the brand owns its tracking infrastructure end to end. Three pieces were delivered in parallel.
A featured deliverable
01 · First-party server-side tracking infrastructure
A featured deliverable
02 · Meta Conversions API rebuilt with deduplication
A featured deliverable
03 · Subscription-aware renewal suppression
The outcome
The Impact
Purchase event match quality climbed from near-zero to 9.3 out of 10.
The contracted acceptance target was 9.0. The score crossed it shortly after go-live and held there.
The server pipeline systematically recovers what the browser pixel cannot see.
Wallet checkouts that bypass the browser entirely still reach Meta cleanly through the server pipeline.
Renewal noise was eliminated from the optimization signal.
The platform's algorithm now trains on first-time buyers only, which is the correct target for a subscription brand.
Engagement expanded into an ongoing infrastructure retainer.
The client moved OST onto a retained engagement covering further product rollouts and expansion to a sister brand.
Tech stack
Tech Foundation
Is your ad dashboard not matching your backend?
OST rebuilds attribution infrastructure for DTC, subscription, and lead-gen brands where tracking is the constraint on growth.