CreatePaymentSubscriptionRequest

{
    "external_id": "membership-1001",
    "amount": 50000,
    "currency": "RUB",
    "email": "customer@example.com",
    "interval": "month",
    "interval_count": 1,
    "description": "Подписка Pro",
    "metadata": {
        "customer_id": "customer-42"
    },
    "callback_url": "https://merchant.example/webhooks/smerch"
}