--- title: Klaviyo API Integration on Truto slug: klaviyo category: Marketing Automation canonical: "https://truto.one/integrations/detail/klaviyo/" --- # Klaviyo API Integration on Truto **Category:** Marketing Automation **Status:** Generally available ## Unified APIs ### Unified Marketing Automation API - **Contacts** — The contact represent a contact in the remote system. - **Lists** — The list represent a list of contacts in the remote system. - **Segments** — Represents a segment of contacts in the remote system. - **Tags** — The tags on a contact in the remote system. ## How it works 1. **Link your customer's Klaviyo account.** Use Truto's frontend SDK; we handle every OAuth and API key flow so you don't need to create the OAuth app. 2. **Authentication is automatic.** Truto refreshes tokens, stores credentials securely, and injects them into every API request. 3. **Call Truto's API to reach Klaviyo.** The Proxy API is a 1-to-1 mapping of the Klaviyo API. 4. **Get a unified response format.** Every response uses a single shape, with cursor-based pagination and data in the `result` field. ## Use cases - **Sync survey and quiz responses into Klaviyo for personalized campaigns** — Form and survey builder SaaS companies can push respondent data into their customers' Klaviyo accounts as enriched Contacts with Tags, enabling merchants to trigger hyper-personalized email and SMS flows based on quiz answers without any manual CSV work. - **Suppress promotional messaging during open support tickets** — Helpdesk and customer support platforms can update Klaviyo Contact properties and Tags in real time when tickets are created or resolved, letting merchants automatically suppress promotional campaigns for customers who are mid-issue — eliminating one of eCommerce's most common CX failures. - **Keep loyalty and rewards data in sync with marketing audiences** — Loyalty and rewards platforms can continuously update Klaviyo Contacts with points balances, tier changes, and reward statuses, so merchants can build dynamic Segments like 'Points Expiring Soon' and drive repeat purchases through automated lifecycle campaigns. - **Route event attendees into targeted post-event follow-up flows** — Webinar and virtual event platforms can automatically push registrants into Klaviyo Lists and tag Contacts as 'Attended' or 'No_Show' after events, giving merchants a seamless path to post-event nurture campaigns without manual data handling. - **Use Klaviyo Segments to personalize in-app experiences** — B2B SaaS products can read their customers' Klaviyo Segments to adapt their own UI — for example, a customer service tool routing 'VIP Segment' members to priority queues, or a personalization engine changing on-site content based on marketing audience membership. ## What you can build - **Automatic Contact enrichment pipeline** — Push user attributes, custom properties, and behavioral metadata from your product into your customers' Klaviyo Profiles so their marketing teams can build dynamic audiences without any manual data entry. - **Real-time Tag-based suppression controls** — Apply and remove Tags on Klaviyo Contacts based on events in your app — like open tickets, pending refunds, or onboarding state — so merchants can suppress or trigger marketing automations contextually. - **One-click List subscription management** — Let your users map actions in your product (form submissions, event registrations, feature opt-ins) to specific Klaviyo Lists, handling subscribe and unsubscribe operations automatically and in compliance with consent requirements. - **Segment-aware in-app personalization** — Read your customers' Klaviyo Segments and surface that audience intelligence inside your product — enabling features like priority routing, dynamic UI badges, or segment-based content targeting. - **Bi-directional Contact sync dashboard** — Give your users a single view that shows which of their end-users exist in Klaviyo, what Lists and Segments they belong to, and what Tags are applied — all without leaving your product. - **Self-serve Klaviyo connection via embedded auth** — Ship a native 'Connect Klaviyo' button in your settings page using Truto's auth infrastructure, so your customers can link their Klaviyo accounts in seconds without your team managing OAuth flows or API keys. ## FAQs ### What authentication method does Klaviyo use? Klaviyo uses API key-based authentication. Your end users generate a private API key from their Klaviyo account settings. Truto handles the secure storage and injection of these keys so your application never manages raw credentials directly. ### Which Klaviyo objects are covered by Truto's Unified Marketing Automation API? The Unified Marketing Automation API maps to four core models: Contacts (Klaviyo Profiles), Lists, Segments, and Tags. These cover the most common integration patterns — profile enrichment, list management, audience reading, and tagging for workflow control. ### Are Klaviyo-specific tools available out of the box? Klaviyo-specific tools beyond the Unified API models are built on request. If you need access to additional Klaviyo endpoints — such as Events/Metrics or Flows — Truto can build custom tools tailored to your use case. ### How does Truto handle Klaviyo's API rate limits? Truto manages rate limiting, retries, and pagination automatically at the platform level. You interact with a consistent API interface and Truto ensures requests to Klaviyo stay within allowed limits, handling backoff and retry logic transparently. ### Can I write custom properties to Klaviyo Profiles through the Unified API? Yes. When creating or updating Contacts via the Unified Marketing Automation API, you can pass custom properties (e.g., loyalty_score, subscription_tier) that map to Klaviyo's custom profile properties. These are immediately usable by merchants for segmentation and flow triggers. ### Are Klaviyo Segments writable through the API? No — Klaviyo Segments are dynamic, rule-based audiences that are computed server-side by Klaviyo. They are read-only via the API. To influence Segment membership, you update the underlying Contact properties or Tags that Segments are built on.