Securing provided REST service using XSUAA

I developed a Mendix application running on SAP Cloud Platform. Doing this I was able  to use XSUAA for user and authorization management ad also to SSO into the application for the web UI. This made it possible to read destinations from the SCP destination service  to connect to on-premises systems. My problem is, that the authentication for incoming REST service calls does not use the XSUAA mechanism and therefore I cannot read destinations. Is there a way to enable the usage of XSUAA for incoming web service calls? Maybe a predefined custom authentication method? Thanks for any hints, Greetings, Matthias
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