curl --request GET \
  --url https://api.stack-auth.com/api/v1/contact-channels

{
  "items": [
    {
      "user_id": "3241a285-8329-4d69-8f3d-316e08cf140c",
      "id": "b3d396b8-c574-4c80-97b3-50031675ceb2",
      "value": "johndoe@example.com",
      "type": "email",
      "used_for_auth": true,
      "is_verified": true,
      "is_primary": true
    }
  ],
  "pagination": {
    "next_cursor": "b3d396b8-c574-4c80-97b3-50031675ceb2"
  }
}