What This Is
We connect your business systems to Klaviyo’s API so that customer profiles, behavioural events, and marketing engagement data flow between your application and Klaviyo automatically. The integration handles profile sync, custom event tracking, list management, and campaign performance data retrieval — all through Klaviyo’s REST API as custom code inside your application.
This is not a Klaviyo plugin install. We build integrations that push rich behavioural data from your application into Klaviyo so you can build segments and flows based on what users actually do — not just what list they are on. When a customer completes a purchase, views a pricing page, upgrades their subscription, or abandons a form, that event is tracked in Klaviyo with full context. Your marketing team builds flows and segments against real behaviour, not guesswork.
A concrete example: a SaaS platform tracks user signup, onboarding completion, feature usage, and plan changes as Klaviyo events. The marketing team builds automated flows — a welcome sequence triggered by signup, a nudge email when onboarding stalls, and a win-back flow when usage drops. All the behavioural data comes from the application’s API integration, not from Klaviyo’s JavaScript snippet.
When You Need This
Klaviyo API integration is the right choice when you need server-side event tracking and profile management beyond what Klaviyo’s built-in integrations provide. Common triggers:
- You need custom event tracking — application-specific events (subscription changes, feature usage, milestone completion) that Klaviyo’s native integrations do not capture
- You want rich profile data from your backend — subscription tier, lifetime value, support history, or usage metrics pushed to Klaviyo profiles
- You are building a multi-channel marketing system using Klaviyo for both email and SMS, driven by events from your application
- You need engagement data in your application — campaign opens, clicks, and flow activity flowing back into your user profiles or CRM
How We Work
Klaviyo integration starts with defining the event catalogue and profile schema — which user actions should be tracked as events, what properties each event carries, and which profile fields should be synced. This catalogue becomes the contract between your application and your marketing team’s flow and segment design.
We build the integration using Klaviyo’s REST API v2024 with API key authentication. Events are tracked via the Track API with full property payloads. Profile updates use the Profiles API for creating and enriching customer records. All API calls are dispatched through queue jobs so event tracking never slows down your application.
List and segment management is handled through the API for operations that need to be programmatic — adding subscribers during checkout, removing profiles on account deletion, or syncing list membership based on application state. Webhooks from Klaviyo are processed for flow and campaign engagement events that need to feed back into your application.
What You Get
- Server-side event tracking — custom events with rich property payloads tracked via the API, independent of frontend JavaScript
- Profile enrichment — customer profiles in Klaviyo updated with application data (plan type, usage metrics, lifecycle stage) for segmentation
- List and segment sync — subscribers added or removed based on application events, with tag and property management
- Multi-channel support — events used for both email and SMS flows within Klaviyo, triggered by a single API integration
- Engagement data retrieval — campaign and flow performance metrics pulled into your application for reporting
- Consent management — subscription preferences and opt-in status synced bidirectionally between your application and Klaviyo
Technologies We Use
- Klaviyo REST API — Track, Identify, Profiles, Lists, Segments, Campaigns, and Metrics endpoints
- Laravel — queue-based event dispatch, profile sync jobs, and webhook processing
- PostgreSQL — event logs, profile mapping, and engagement data storage
- Redis — rate limiting and batch event queuing
Related Systems
Klaviyo integration connects marketing automation to your core application — an e-commerce system that tracks purchase behaviour for email flows, a SaaS platform that triggers lifecycle emails based on usage, or a CRM that enriches contact records with marketing engagement data.
Talk to Us About Marketing Automation Integration
If you need application events driving your email and SMS marketing, get in touch and we will define the event catalogue and build the connection.
