Server-to-server conversion tracking means your server tells an ad platform about a conversion directly, instead of relying on a script running in the visitor’s browser. Meta calls its version the Conversions API, Google has server-side tagging and offline conversion imports, and TikTok has the Events API. The idea is the same in each: the server reports what actually happened.
How it works, step by step
- A visitor clicks an ad and lands on your store. The click ID (for example fbclid or gclid) is saved.
- The visitor buys. Your store, or a server container that receives the order, records the confirmed purchase.
- The server sends the purchase to the ad platform with the order value, currency and the click ID or customer details that allow matching.
- The platform matches the purchase to the ad and uses it for reporting and optimization.
Browser tracking vs server-to-server
| Browser tag | Server-to-server | |
|---|---|---|
| Sees the event | Only if the script loads and is not blocked | From your own server, after the order exists |
| Affected by ad blockers | Yes | Much less |
| Order accuracy | Depends on the page | Can use confirmed order data |
| Setup effort | Low | Higher: server, matching data, deduplication |
| Needs consent handling | Yes | Yes |
Common ways to set it up
- Platform integrations. Some store apps send events to Meta or TikTok for you. They are quick but offer less control.
- A server-side GTM container. Events go from the browser to your own server container, which forwards them to each platform. One setup serves several platforms.
- Direct API calls. Your backend calls each platform’s API. Flexible, but more development work.
What to get right
- Send the same event ID from the browser and the server so platforms can deduplicate.
- Pass the click ID and the customer details you have permission to send, since matching depends on them.
- Respect consent. Server-side does not remove the need for it.
- Test with the platform’s own test tools before trusting the numbers.
If you want this built and checked end to end, see our server-side tracking setup, or start with a free tracking audit to see what your store sends today.
