- 20+Shopify builds shipped
- +28%Avg conversion lift
- 90+Avg Lighthouse score
- 6–10 wksTypical build
Where the native app runs out of road
Klaviyo's out-of-the-box Shopify sync is a fair start. Once your data, catalogue or front end gets specific, the gaps show up in flow performance and segment accuracy.
Custom data never arrives
Metafields, custom catalogue properties, back-in-stock and subscription state rarely map cleanly through the standard connection.
Flows fire on the wrong signal
When events are missing or delayed, abandoned-cart and post-purchase flows trigger late, double up, or skip customers entirely.
Segments quietly drift
Profiles duplicate, consent state goes stale and loyalty or subscription data never reaches Klaviyo, so segmentation degrades over time.
Headless breaks the link
On Hydrogen or a custom front end, client-side tracking gaps mean Klaviyo stops seeing real on-site behaviour.
What syncs which way
Every object mapped to a direction, a trigger and a system of record before a line of code is written.
| Direction | Trigger | System of record | |
|---|---|---|---|
| Orders & line items | Shopify → Klaviyo | Order webhook (real-time) | Shopify |
| Catalogue & variants | Shopify → Klaviyo | Product update + nightly sync | Shopify |
| Checkout & cart events | Shopify → Klaviyo | Client + server-side events | Shopify |
| Back-in-stock signals | Shopify → Klaviyo | Inventory webhook | Shopify |
| Profiles & custom props | Two-way | Signup, order, profile change | Shopify (identity) |
| Consent & suppression | Klaviyo → Shopify | Subscribe / unsubscribe | Klaviyo |
What we build into the integration
A clean data layer between Shopify and Klaviyo, mapped to your flows, your catalogue and your consent model, then monitored so it stays honest.
What syncs
- Products, variants and inventory as a reconciled catalogue feed
- Customer and profile data, including metafields and custom properties
- Orders, line items and fulfilment status
- Checkout, cart and browse events
- Back-in-stock and price-drop signals
- Marketing consent and subscription status
- Custom events for loyalty, reviews and quizzes
How it works
- Shopify is system of record for orders, catalogue and inventory
- Klaviyo owns marketing consent and suppression state
- Real-time events via Shopify webhooks and Klaviyo's Events API
- Server-side tracking for headless and consent-safe capture
- Nightly catalogue and profile reconciliation to catch drift
- Two-way profile sync only where it earns its keep
Reliability
- Idempotent event delivery with retry and back-off
- Dead-letter queue for failed payloads
- Structured, auditable logging of every sync
- Alerting when the Klaviyo API errors or rate-limits
- Replay tooling to backfill missed events cleanly
How we deliver it
A predictable path from audit to monitored production, with the data design signed off before the build starts.
Discovery
Audit your Shopify setup, Klaviyo account, existing flows and the exact data gaps costing you revenue.
Data-flow design
Map every object, direction, trigger and system of record, then agree it with you before we write code.
Build
Implement webhooks, server-side events, the catalogue feed and reconciliation against the signed-off design.
UAT
Test flows end to end against real scenarios and verify segments, consent and profile matching.
Deploy
Ship behind checks and migrate cleanly, with no duplicate profiles and no double-sends.
Monitor & support
Logging, alerting and a support line for when the API misbehaves, plus replay to backfill anything missed.
Klaviyo integration questions
Related services
Scope a Shopify Klaviyo integration
Tell us your stack and your flows. We'll map the data, the direction and the edge cases, then give you a scoped, fixed plan.
Book a scoping call
