I am creating this app using Next.js and their api-routes and I have an auth-flow that:

1. redirects and let's the user log in with a company Social-Login and redirects to:
2. my /api/getaccesstoken, which uses the query params to get a User-Object and an AccessToken
3. then it goes back to /, currently using res.redirect("/")

How can I send some User Info and additional data without using query params ?