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API key

All API calls require the api_key parameter. You can find your API Key in the Kit developer settings page under the V3 Key section. API V3 key

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API secret key

Some API calls require the api_secret parameter. All calls that require api_key also work with api_secret, there’s no need to use both. This key grants access to sensitive data and actions on your subscribers. You should treat it as your password and shouldn’t use it in any client-side code (usually that means JavaScript). This can also be found in the Kit developer settings page under the V3 Key section. API V3 key

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Integration Key

We no longer support the creation of new integration keys for V3 of the API. If you would like to build a new integration with Kit, please refer to our documentation for building apps for the Kit App Store. If you encounter any issues with your integration key for a pre-existing integration, please reach out to the Kit support team, who will be able to assist you.