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Get started with Klaviyo

Get started with Klaviyo's APIs in a few easy steps. Log in, grab your API credentials, and start developing.

What is Klaviyo?

Klaviyo is a powerful email and SMS marketing tool with a strong commitment to data science. Our integrations library and API make it simple to build emails and experiences that are truly personal at scale.


Are you looking to build an integration with Klaviyo and become a partner? Check out our partner resources.

Take the Klaviyo developer certificate

Kickstart your journey as a Klaviyo developer with the Klaviyo developer certificate. Learn the fundamentals of building with Klaviyo:

  • Understand Klaviyo's data model
  • Understand our APIs
  • Get access to key resources and developer tools
  • Explore use cases and examples of building with both server-side and client-side APIs
  • Learn how to troubleshoot and handle errors

Ready to get started?

Welcome to the Developer guides! Follow along the steps below, or select a step to begin, and get started building with Klaviyo today.

  1. Create a test account (optional)
  2. Generate sample data
  3. Install a library (optional)
  4. Obtain API credentials
  5. Authenticate
  6. Make a test API request
  7. Use Klaviyo's Postman collections
  8. Rate limits & error handling

Then, level up your knowledge with in-depth code guides:

Learn Klaviyo fundamentals with an overview of Klaviyo's data model and architecture:

Not a developer?

Head on over to the Help Center to browse a comprehensive collection of how-to's and guides for using Klaviyo products and getting connected to our native integrations.