SubscriptionCreate

{
    "model": "call",
    "post-url": "https://webhook.example.com/events",
    "domain": "example.com",
    "user": "*",
    "reseller": "example-reseller",
    "subscription-geo-support": "yes",
    "subscription-expires-datetime": "2027-09-01T14:30:00+00:00",
    "preferred-server": "core1.example.com"
}