curl --request POST \
  --url http://localhost:8080/cabinet/promo/claim \
  --header 'Content-Type: application/json' \
  --data '
{
  "offer_id": 123
}
'

{
  "success": true,
  "message": "<string>",
  "discount_percent": 123,
  "expires_at": "2023-11-07T05:31:56Z"
}