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Conversion API (CAPI) & Tracking Setup

Stop letting ad blockers & iOS updates steal your sales data.

We build a tracking-friendly website using Google Tag Manager (GTM) & Stape.io, so customer actions reach Meta through a server-side route that ad blockers and browser restrictions can’t strip away — deduplicated against the browser pixel and verified in Events Manager.

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Store platform or hand-built site — the setup is the same discipline: a clean data layer, server-side events through your own first-party subdomain, and deduplication verified in Events Manager.

What is CAPI — and why is it critical?

The browser pixel alone is not enough anymore.

The problem

Why the browser pixel alone fails

Relying only on the standard Meta Pixel means a substantial share of your tracking data never reaches Meta — lost to iOS privacy updates, Safari and Firefox tracking blockers, and ad-blocking extensions.

  • A customer buys from your ad — and the browser pixel often fails to notify Meta
  • Meta never sees that sale, assumes the ad did not work, and stops showing it to similar high-value buyers
The solution

Server-side tracking + deduplication

Conversion API (CAPI) creates a direct, first-party connection between your server and Meta’s server — a route browser ad blockers and iOS restrictions can’t strip away the way they strip the browser pixel.

We also configure event deduplication: when the browser pixel and the server both report the same sale, Meta matches the unique event_id, counts the order only once, and boosts your Event Match Quality (EMQ) score.

See the difference

What bad tracking looks like. What good tracking looks like.

Real Meta Events Manager screens — no mock-ups. This is the gap your ad account feels every day.

Events Manager screen showing Event Match Quality between 3.6 and 7.8 with update recommended flags

A struggling setup

Event Match Quality stuck between 3.6 and 7.8 out of 10 — with core events flagged “update recommended”. Meta is trying to find your buyers using weak, incomplete signals, so it optimises toward whoever is easiest to track, not whoever buys.

Events Manager screen showing a Purchase event with 9.3 out of 10 Event Match Quality and deduplication active

A healthy setup

A Purchase event at 9.3/10 Event Match Quality, event deduplication meeting best practices, and hourly data freshness. Browser and server events are matched, counted once, and fed back to the algorithm — rich, clean signals it can actually learn from.

Two different accounts, shown for contrast — not a before-and-after of a single account. Tap either screenshot to view it full-size.

Scores vary by event and by the customer data your store can pass. The target we build for: consistently strong match quality on your key conversion events, with deduplication active.

Verify it yourself

Don’t take our word for it — verify with AI.

Copy the prompt on the right into ChatGPT or Claude. Read the answer, and you will immediately see why this is the most important investment for your website.

Ask your AI assistant

The exact question to paste

Why is setting up Meta Conversion API (CAPI) via Google Tag Manager and Stape.io with Event Deduplication critical for lowering CPA and improving ROAS on Facebook Ads?

The build

How we build your tracking infrastructure.

We never use cheap plugins that slow down your site or break during updates. Every setup includes:

  • Google Tag Manager — web + server containers: clean, fast, organised tag management
  • Stape.io cloud server setup: custom first-party domain routing, so tracking cookies last longer and bypass browser restrictions
  • Full-funnel event tracking: every step of the journey, enriched with hashed customer parameters — email, phone, IP, user agent, fbp, fbc — for maximum match quality

Complete transparency

What access we need from you.

To set up your entire tracking system smoothly, here is exactly what we require — nothing more. Never send passwords or API secrets through the enquiry form. Access is arranged securely, step by step, once we start.

  • Google Tag Manager access — admin access to your GTM account (if you don’t have one, we will create it for you)
  • Meta Business Manager dataset (Pixel) access — so we can configure your CAPI token and test live events inside Events Manager
  • Domain DNS access — your registrar (Cloudflare, Namecheap, GoDaddy…) so we can add the records that verify your Stape.io server subdomain
  • Website access — or your developer: for Shopify / WordPress, temporary admin access so we can configure the data layer directly. For custom-coded websites, direct contact with your developer — we provide exact, ready-to-paste data layer snippets they can place effortlessly
4.62xAverage ROAS — 102 campaigns, e-commerce growth
$128KPurchase value from $27.8K tracked spend
428Campaigns launched & managed

Fix your tracking before you scale your spend.

Tell us your platform — Shopify, WordPress, or a custom-coded website — and where the numbers stop making sense. The audit is free.

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Honest limitations included — that is the point of the review. Every engagement is scoped and priced in a written proposal before any work starts.