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Send the key as a Bearer token:
New integrations must use mbn_test_ or mbn_live_ project keys. Legacy keys can remain accepted during a compatibility window but should not be used for new work. Never expose a key in browser JavaScript, a mobile binary, a query string, a public repository, or application logs.

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Key environments

Use a mbn_test_... key while developing and a mbn_live_... key only for production traffic. Keys are scoped to the project that created them. The project scope is selected by the key; it cannot be supplied or overridden in the request body.

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Rotation

Create a replacement key, deploy it to your server, verify traffic in the project logs, and then revoke the old key. If a key is exposed, revoke it immediately and create a replacement.
The API returns a request ID for support and troubleshooting.