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curl -X POST https://your-domain.com/api/convert-auth \
-H "Content-Type: application/json" \
-H "x-api-key: YOUR_API_KEY" \
-d '{
"html": "<h1>Hello World</h1>",
"options": {
"format": "A4",
"margin": { "top": "1cm" }
}
}' \
--output document.pdf