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When it fires

After UpdateSubscription writes changes. Typically triggered by the Polar subscription.updated webhook handler. actor is always null.

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Payload

{
    type: 'subscription.updated',
    data: {
        subscription: {
            id: string
            status: string
            polarSubscriptionId: string
            polarProductId: string
            currentPeriodStart: string | null
            currentPeriodEnd: string | null
            canceledAt: string | null
        }
        changes: Array<'status' | 'currentPeriodStart' | 'currentPeriodEnd' | 'canceledAt'>
    }
}

​
Example — cancellation

{
    "type": "subscription.updated",
    "actor": null,
    "data": {
        "subscription": {
            "id": "0192a1b2-c3d4-7000-8000-0000000000c0",
            "status": "canceled",
            "polarSubscriptionId": "sub_abc123",
            "polarProductId": "prod_xyz789",
            "currentPeriodStart": "2026-05-31T00:00:00.000Z",
            "currentPeriodEnd": "2026-06-30T23:59:59.999Z",
            "canceledAt": "2026-06-10T15:00:00.000Z"
        },
        "changes": ["status", "canceledAt"]
    }
}