curl --request POST \
  --url http://localhost:8080/miniapp/subscription/tariff/purchase \
  --header 'Content-Type: application/json' \
  --data '
{
  "initData": "<string>",
  "tariffId": 123,
  "periodDays": 123
}
'

{
  "success": true,
  "message": "<string>",
  "subscription_id": 123,
  "tariff_id": 123,
  "tariff_name": "<string>",
  "new_end_date": "2023-11-07T05:31:56Z",
  "balance_kopeks": 123,
  "balance_label": "<string>"
}