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The Yuko API uses HTTP Bearer Authentication to authenticate requests. All API requests must be made over HTTPS. To authenticate, include your API key in the Authorization header of every request: 
Authorization: Bearer YOUR_API_KEY
You can find your API key in the Yuko Dashboard under Settings → API. Keep your API keys secure. Do not expose them in client-side code, mobile app binaries, or public repositories. All API calls containing your secret key must be made from your backend server.