curl --request POST \
  --url https://api.flexslot.gg/api/public/v1/oauth/introspect \
  --header 'Content-Type: application/x-www-form-urlencoded' \
  --data 'token=<string>' \
  --data 'token_type_hint=<string>' \
  --data 'client_id=<string>' \
  --data 'client_secret=<string>'

{
  "error": "<string>",
  "error_description": "<string>"
}