Hi, we've got a use-case where we're using the same instance for admin and customer login(both are hostel on different URLs and are different roles), we're using the magic link for login in both cases, in the admin side we're using the Supertokens react components and in customer login, we're using Custom UI (createCode function). We want to send custom headers from the frontend to identify the type of user, but I couldn't figure out a way to do it based on the documentation so can you please help how we can achieve this?