curl --request POST \
  --url http://localhost:8080/miniapp/promo-codes/activate \
  --header 'Content-Type: application/json' \
  --data '
{
  "initData": "<string>",
  "code": "<string>"
}
'

{
  "success": true,
  "description": "<string>",
  "promocode": {
    "code": "<string>",
    "type": "<string>",
    "balance_bonus_kopeks": 0,
    "subscription_days": 0,
    "max_uses": 123,
    "current_uses": 123,
    "valid_until": "2023-11-07T05:31:56Z"
  }
}