curl --request POST \
  --url https://api.steamgold.dev/v1/promo/verify \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "code": "<string>"
}
'

{
  "code": 123,
  "type": "commission",
  "discount": 123
}