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All API requests must be authenticated using an API key. You can manage your API keys in the Dashboard.

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API Key Types

We provide two types of API keys:
  • Live Keys (fine_live_...): Used for production invoice generation. These incur costs and generate clean PDFs.
  • Test Keys (fine_test_...): Used for development. Invoices are free but will contain a “TEST” watermark.

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Using your API Key

Include your API key in the X-API-Key header of every request. 
curl -X POST https://api.FinePDF.dev/v1/invoices/generate \
  -H "X-API-Key: fine_live_your_key_here" \
  -H "Content-Type: application/json" \
  -d '{ ... }'
Never share your API keys publicly or include them in client-side code. They should only be used in secure back-end environments.