Send custom events and trigger flows in Klaviyo for post-purchase and behavioral automation

Steps

1. Use the Klaviyo Track API by POSTing to https://a.klaviyo.com/api/events/ (v3) with Authorization: Klaviyo-API-Key header and a payload containing data.type (event), data.attributes.metric.name, data.attributes.profile (with email or phone), and data.attributes.properties for event metadata
2. Track standard commerce events such as 'Placed Order', 'Ordered Product', 'Fulfilled Order', and 'Refunded Order' using Klaviyo's expected property schema so built-in flow templates and reports work without remapping
3. Track custom behavioral events (e.g., 'Viewed Size Guide', 'Used Coupon', 'Submitted Review') with arbitrary property dictionaries to power segmentation and personalization flows
4. Create profiles or update profile properties via POST /api/profiles/ or PATCH /api/profiles/{profile_id} to set custom attributes like loyalty_tier, total_spend, or preferred_category used for flow branching
5. Build Klaviyo flows in the dashboard triggered by your custom metric names, adding conditional splits based on event properties or profile attributes to personalize the messaging
6. Use the Klaviyo identify call alongside track calls to ensure events are tied to the correct profile, especially in server-side contexts where the cookie-based identity is unavailable