External content by Daniel Krüger; January 26, 2025 ; 
The original post has appeared on daniels-notes.de

While WEBCON BPS 2025 does not support certificate authentication by default, the R1 release added a new SDK type the “CustomRESTAuthentication”.
This allows us to implement our own authentication options. I made use of this to add support for accessing SharePoint using client id/certificate instead of client secret.
A few features I implemented:

• Providing custom body and headers

• Reusing the access token

• Reusing the proxy

You can find the link to the repository and and explanation im my blog post: SharePoint Online certificate authentication