Integration
Shopify + Google Ads Attribution: Beyond Last-Click ROAS
Google Ads takes credit for every branded search purchase. Causality Engine shows what your Google traffic caused, next to what last-click gave it.
- What Google Ads reports8.5x
- On the sales it actually caused3.1x
A read of your own GA4 export shows what Google Ads actually caused, next to what last-click gave it, with a data-health score on the channel.
Why Google Ads over-reports
- Branded search captures existing demand, customers who would've bought anyway get attributed to Google
- Google's data-driven attribution model is a black box that still favors Google channels
- Last-click attribution gives Google 100% credit when it's the final touch, ignoring discovery channels
- Smart Bidding optimizes for Google's attribution model, not your actual incrementality
- Shopping campaigns get credit for price-comparison clicks that would've happened organically
How Causality Engine fixes Google attribution
- Puts what Google Ads caused next to what last-click gave it, so captured demand stops passing for created demand
- Causal inference measures what would've happened WITHOUT Google Ads, the real test of value
- Direct is split back to the channels that sent those buyers, so Google's share sits alongside Meta, TikTok and email
- Shows whether Paid Search keeps its last-click credit once what it caused is separated from what it only touched
- No dependency on Google's attribution model, independent measurement from your own data
How to set up Google Ads attribution
Export your GA4 data
Export 12 months or more of GA4 data. Longer reads better. No app to install, no permissions to grant.
Upload the file
We analyze every channel in the export, not just Google.
See what Google Ads caused
Paid Search and your other Google channels next to last-click, with a data-health score on each.
Google Ads: at a glance
| Metric | Google Ads reports | Causal read |
|---|---|---|
| Credit for a sale | Sales it claims, by its own rules | What it caused, next to last-click |
| Tracking method | Pixel + modeled | Causal inference |
| Pixel required? | Yes | No |
Terms on this page: Google Ads, Data-driven attribution, Google Shopping.
Frequently asked questions
Can Causality Engine separate branded vs. non-branded Google Ads impact?
Not inside Google Ads. The read works on the channels GA4 records, so Paid Search is one channel, branded and non-branded together. What it shows is whether Paid Search keeps its last-click credit once Direct is split back and what it caused is separated from what it only touched.Does this replace Google Analytics attribution?
It complements it. GA4 tells you what happened (which channels touched which users). Causality Engine tells you what caused what, which channels actually drove incremental sales that wouldn't have happened otherwise.How does this work with Performance Max campaigns?
Performance Max is a black box inside Google. Causality Engine measures the total causal impact of your PMax spend from the outside, using your GA4 export. You'll see whether PMax is truly incremental or just re-targeting existing demand.Do I need to share my Google Ads account?
No. We only need your GA4 export. We measure Google's impact from your own analytics data, not from Google's ad platform.
Your platforms guess.
We run the math.
Upload a GA4 export and see what each channel caused, next to last-click, in 1–2 minutes. The read is yours to keep.
The free finding runs in your browser. Your file never leaves it. The full read is €99, refundable within 30 days, no questions asked. Prices exclude VAT.