Authentication

Authenticate requests with a Bearer API key.

All requests require an API key in the Authorization header.

Authorization: Bearer sk_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

API keys are managed from Settings → Newsletter → API Keys — see the API Keys guide for how to create, revoke, and delete them. The newsletter is resolved directly from the API key.

The API key scope is limited to the newsletter it was created for. A key cannot read or modify subscribers of another newsletter.