php - phpSPO authentication with certificate rather than clientSecret

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I am trying to use vgrem's phpSDO library to access a SharePoint online site from our webserver in PHP

The examples in the documentation use clientId and clientSecret but when I asked our admin to set up SharePoint App-Only access, they gave me a clientId and a certificate. I can't figure out how to use these with phpSPO.

Is this authentication method supported in phpSPO? If so how do I use it?