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Syncing events to Klaviyo server-side uses the Track API (for events) and Identify API (for profile updates). WordPress implementation leverages WooCommerce hooks and wp_remote_post() for reliable, automatic event streaming. Klaviyo Track API Endpoint Payload Structure Required fields:

• token
• Public API key (6-character alphanumeric)
• event
• Event name (custom or Klaviyo standard)
• customer_properties.$email
• Email to identify customer profile Optional fields:
• properties
• Event metadata (product details, revenue, custom data)
• time
• Unix timestamp (defaults to current time if omitted) Example Payload WordPress/WooCommerce Implementation Track Order Completion Use woocommerce_checkout_order_processed hook: Track Subscription Events Track subscription status changes: Track Custom Events Example: Product review submitted Klaviyo Identify API Update Profile Properties (Without Event) Endpoint: Use case: Update customer profile fields without tracking an event. Example: Update customer tier Example: Calculate and update Lifetime Value Authentication Finding Your Public API Key Klaviyo account: 1. Navigate to Settings...