[keycloak-user] Convert Keycloak tokens to "cookies" for a Spring-boot app

[Hylton Peimer]

I have a backend server secured using Keycloak Spring web security adaptor.

The UI uses the cookies to store the session reference.

Now another website would like to implement "SSO" - have a link in their
page to connect directly into my application. This other website is able to
obtain access/refresh tokens directly from the Keycloak.

How can I "convert" the access token to a cookie, which will be recognized
by my Spring backend?