Klaviyo is an email marketing service that allows companies to send targeted and transactional emails to their audiences.
The Klaviyo API allows developers to access and integrate the functionality of Klaviyo with other applications. Some example API methods include retrieving and managing events, managing account information, and retrieving analytics data about email marketing campaigns.
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The Klaviyo Ruby SDK by Klaviyo interacts with the API to implement email marketing features into web projects. Resources explain how to use the SDK with Ruby, providing code to insert Klaviyo code in an application, record customers' actions, and record events.