if you want to create a common portal for the two sites, it would require supertokens to be an oauth provider, which we are not (yet). But you could build something like the implicit oauth flow on top of supertokens relatively easily to enable this. Alternatively, adding login UI to each of the two sites also works (and you can share the same user pool for them by using a common supertokens core). But this would mean that a user logged into a.com will also have to separately login into b.com

let me try and find it

maybe this will help ^^