curl --request POST \
  --url http://localhost:8080/cabinet/promocode/activate \
  --header 'Content-Type: application/json' \
  --data '
{
  "code": "<string>"
}
'

{
  "success": true,
  "message": "<string>",
  "balance_before": 0,
  "balance_after": 0,
  "bonus_description": "<string>"
}