curl --request GET \
  --url https://discord.com/api/v10/oauth2/userinfo \
  --header 'Authorization: <api-key>'

{
  "sub": "<string>",
  "email": "<string>",
  "email_verified": true,
  "preferred_username": "<string>",
  "nickname": "<string>",
  "picture": "<string>",
  "locale": "<string>"
}