Server-Side Tracking: The Strategy That Increased Data by +40% for Clinik.ch

In a digital ecosystem where data privacy (GDPR, nFADP) and technological restrictions (ITP, AdBlockers) are redefining the rules of the game, measurement accuracy becomes the crux of the matter.

Today, we dissect a case study: the complete overhaul of tracking for Clinik.ch, the Swiss leader in laser hair removal and medical rejuvenation in partnership with the agency Emblematik in Lausanne.

By transitioning from traditional "Client-Side" tracking to a robust Server-Side architecture via Stape.io, we not only brought the site into full compliance but also recovered a massive amount of invisible data, radically transforming the performance of advertising campaigns.

The Client: Clinik.ch, Technological Excellence in Aesthetics

With over 10 clinics in Switzerland and more than 400,000 treatments performed, Clinik.ch positions itself in a high-end sector. Their promises?

• Advanced medical technologies (Medical Lasers, Nordlys, Visia 3D).

• Strict medical supervision for safe treatments (permanent hair removal, rejuvenation).

• Personalized approach (free diagnosis, custom treatment plans).

For a company investing in the best laser technologies, it was imperative that its digital infrastructure be equally high-performing.

The Challenge: The "Black Box" of Client-Side Tracking

Before A-Track's intervention, Clinik.ch used classic browser-based tracking (Client-Side) for all its levers: GA4, Google Ads, Meta, Microsoft Ads, etc.

The problem? A critical loss of data due to several factors:

• Ad Blockers & VPN: Increasingly used by Swiss internet users concerned about their privacy.

• Apple ITP (Intelligent Tracking Prevention): Safari drastically limits cookie lifespan (often 24 hours or 7 days), breaking conversion attribution.

• Consent (Cookie Consent): With 21% of users refusing cookies (Cookie-Script statistics), a large portion of conversions disappeared from radar.

Result: Artificially high customer acquisition costs (CPA) and blind campaign management.

The A-Track Solution: Full Server-Side Architecture

To counter these losses, we deployed a custom tagging plan and migrated all tracking to the server.

1. Technical Infrastructure via Stape.io

We used Stape.io to host the GTM (Google Tag Manager) server container.

• Client Side: Use of the "Stape Data Tag" to send data securely.

• Server Side: The "Stape Data Client" receives, cleans, and redistributes data to platforms (GA4, Meta CAPI, TikTok CAPI, etc.).

This configuration allows bypassing Ad Blockers (by using a custom 1st party subdomain) and extending cookie lifespan.

2. Multi-Channel CAPI (Conversion API) Implementation

We no longer rely solely on the browser pixel. We now send "Server-to-Server" events for maximum reliability:

• Meta CAPI (Facebook/Instagram)

• TikTok Events API

• Pinterest API for Conversions

• Snapchat Conversions API

Each event is deduplicated (unique Event ID) to ensure a conversion is not counted twice.

3. Compliance & Consent Mode v2

Performance must not sacrifice legality.

• CMP: Integration of Cookie-Script with the IAB TCF 2.2 standard.

• Google Consent Mode v2: Implemented to model conversions for users who did not give consent (the famous 21% refusal), allowing Google to "fill the gaps" using AI.

The Results: +40.41% of Data Recovered

The numbers speak for themselves. Comparing post-production performance (November 2025) to the average of previous months (September-October 2025), the impact is immediate.

1. A Massive Gain in Visibility

Thanks to Server-Side tracking, Stape.io reports a 38.49% improvement in data capture. Add to that +1.92% of recovered data specifically from users under AdBlock, VPN, and private browsing. Total impact: +40.41% more usable data.

2. Explosion of Google Ads Performance

With a nearly stable budget (+3.65%), campaign efficiency took off:

• Conversions: +33% (1630 total conversions).

• CPA (Cost per Acquisition): Decrease of 22% (CHF 58.67 compared to CHF 75.16 previously).

• Traffic Quality: Fewer clicks (-28%) but much more qualified, proving better algorithmic targeting thanks to enriched data (Enhanced Conversions).

• Generated Calls: Explosion from 109 to 437 phone calls.

3. The Awakening of Social Ads

The contribution of CAPI (Server-Side) transformed social networks into real business generators:

• Meta (Facebook/Instagram): Increase from 77 to 179 appointments (+132% in 1 month).

• Pinterest: Increase from 0 to 412 appointments (a previously inactive channel).

• TikTok: Increase from 0 to 105 appointments.

• Snapchat: Increase from 60 to 104 appointments.

4. Measurable ROI on GA4

For the first time, GA4 reports precise monetary values, showing +134,000 CHF of tracked conversion value, finally allowing for the calculation of a real ROAS.

Conclusion

The case of Clinik.ch demonstrates that in 2025, digital performance no longer depends solely on the quality of ads or budget, but on the quality of technical data.

By switching to Server-Side with A-Track, Clinik.ch transformed an invisible "technical loss" into a concrete revenue gain (+33% conversions, new acquisition channels activated).