We use Microsoft OAuth authentication endpoints with the client credentials flow. You can find Microsoft's documentation for the client credentials flow here.

Our technical support team will provide you with API credentials, including the following information:

client id (sometimes called application id)
client secret (sometimes called password)

Once you have API credentials, you can create an access token by calling the token endpoint.

You can then use the access_token value in the Authorization header for the API endpoints.

Authorization: Bearer <access_token>