The API uses API keys to authenticate requests. You can view and manage your API keys in your settings page under the security tab in

API Keys are under Settings > Security

Test mode secret keys have the prefix cal_ and live mode secret keys have the prefix cal_live_.

Your API keys carry many privileges, so be sure to keep them secure! Do not share your secret API keys in publicly accessible areas such as GitHub, client-side code, and so forth.

Authentication to the API is performed via URL Query Params. Provide your API key as a query param like:

All API requests must be made over HTTPS. Calls made over plain HTTP will fail. API requests without authentication will also fail.

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