curl --request GET \
  --url https://api.hyperline.co/oauth/userinfo \
  --header 'Authorization: Bearer <token>'

{
  "given_name": "John",
  "family_name": "Doe",
  "name": "John Doe",
  "picture": "https://...",
  "email": "john@doe.com",
  "email_verified": true
}