Full Answer
Server-side tracking with Klaviyo guarantees 100% event capture by sending data directly from your server to Klaviyo's API, bypassing browsers entirely. This is essential for transactional events (purchases, subscriptions) and beneficial for behavioral tracking accuracy. When to Use Server-Side Klaviyo Tracking Essential Use Cases (Server-Side Required) 1. Transactional Events
- Order completions
- Subscription renewals
- Refunds/cancellations
- Payment failures
- Account upgrades/downgrades Why: These trigger revenue-impacting email flows. Missing even 1% is unacceptable. 2. Backend Processes
- Recurring billing events
- Admin-initiated actions (manual refunds)
- Automated workflows (abandoned cart recovery)
- System-generated events (low inventory alerts) Why: No browser involved—server-side is only option. 3. Mobile Apps
- Native iOS/Android apps
- In-app purchases
- App events (onboarding steps) Why: No web browser, no JavaScript—server-side required. 4. High-Value Events
- VIP customer upgrades
- Large order completions ($500+)
- Subscription starts (high LTV)
- Critical user actions Why: Can't...
