Klaviyo Access the Klaviyo API with managed OAuth authentication. Manage profiles, lists, segments, campaigns, flows, events, metrics, templates, catalogs, and webhooks for email marketing and customer engagement. Quick Start Base URL Replace with the actual Klaviyo API endpoint path. The gateway proxies requests to and automatically injects your OAuth token. Authentication All requests require the Maton API key in the Authorization header: Environment Variable: Set your API key as : Getting Your API Key 1. Sign in or create an account at maton.ai 2. Go to maton.ai/settings 3. Copy your API k…