curl --request POST \
  --url https://api.example.com/miniapp/subscription/purchase/options \
  --header 'Content-Type: application/json' \
  --data '
{
  "initData": "<string>"
}
'

{
  "currency": "<string>",
  "success": true,
  "balanceKopeks": 123,
  "balanceLabel": "<string>",
  "subscriptionId": 123,
  "data": {}
}