# Polar subscription ended notifications on your phone

> Get a push notification when a Polar subscription really ends and the customer loses access, whether it ran out after a cancellation or payment retries failed.

- Company: Polar (https://www.justpush.io/recipes/polar)
- Event: `subscription.revoked` (subscription.revoked)
- Tags: Payments & billing, Subscriptions
- Install: https://studio.justpush.io/recipes/polar/subscription-revoked
- Web page: https://www.justpush.io/recipes/polar/subscription-revoked

## Setup

1. Click Install in Studio and sign in. The recipe is added to your account and you get a personal webhook URL.
2. In the Polar dashboard, open Settings > Webhooks and click Add Endpoint.
3. Paste your webhook URL (shown in Studio after install) as the URL and leave the format on Raw.
4. Generate a secret (JustPush doesn't need it), tick the subscription.revoked event and save.
5. Tick **subscription.revoked**. This is the real end of a subscription, when the customer loses access: at the end of the period after a cancellation, straight away on an immediate revocation, or when payment retries run out. Pair it with the *Subscription canceled* recipe to hear about the cancellation itself.
6. A subscription that ended because payment failed (status `unpaid`) gets a louder **💸 Subscription ended: unpaid** push.
7. Testing in the **sandbox**? Add `?sandbox=1` to the URL so the button opens the sandbox dashboard.
8. Polar signs every delivery (`webhook-id`, `webhook-timestamp`, `webhook-signature`; Standard Webhooks for secrets made on or after 8 September 2026), but JustPush doesn't check that signature yet, so keep your endpoint URL private.

## Code

Studio calls `handleRequest(request)` with the incoming webhook (`{ method, headers, body, query, raw }`) and sends the message object it returns. Returning `null` sends nothing.

```js
// Polar → subscription.revoked
// Fires when a subscription really ends and the customer loses access: at the end of the
// period after a cancellation, straight away on an immediate revocation, or when payment
// retries run out (status "unpaid").
// Docs: https://polar.sh/docs/api-reference/current/subscription_revoked

// Polar amounts are in the currency's smallest unit (cents), except zero-decimal currencies.
const ZERO_DECIMAL = new Set([
    "bif", "clp", "djf", "gnf", "jpy", "kmf", "krw", "mga",
    "pyg", "rwf", "ugx", "vnd", "vuv", "xaf", "xof", "xpf",
])

function money(amount, currency) {
    if (typeof amount !== "number" || !Number.isFinite(amount) || typeof currency !== "string" || !currency) return null

    const code = currency.toLowerCase()
    const value = ZERO_DECIMAL.has(code) ? amount : amount / 100

    try {
        return new Intl.NumberFormat("en-GB", { style: "currency", currency: code.toUpperCase() }).format(value)
    } catch {
        return `${value} ${code.toUpperCase()}`
    }
}

// "€19.00/month", or "€49.00 every 3 months".
const INTERVALS = { day: "day", week: "week", month: "month", year: "year" }

function price(sub) {
    const amount = money(sub.amount, sub.currency)
    const unit = pick(INTERVALS, sub.recurring_interval, null)

    if (!amount) return null
    if (!unit) return amount

    const count = Number.isInteger(sub.recurring_interval_count) ? sub.recurring_interval_count : 1
    return count > 1 ? `${amount} every ${count} ${unit}s` : `${amount}/${unit}`
}

// "29 Oct 2026" from an ISO timestamp, or null.
function day(value) {
    const date = typeof value === "string" ? new Date(value) : null
    return date && !Number.isNaN(date.getTime())
        ? date.toLocaleDateString("en-GB", { day: "numeric", month: "short", year: "numeric", timeZone: "UTC" })
        : null
}

// Table lookup that ignores inherited names such as "toString".
function pick(table, key, fallback) {
    return typeof key === "string" && Object.prototype.hasOwnProperty.call(table, key) ? table[key] : fallback
}

// Only link to real http(s) URLs.
function link(url, cta) {
    return typeof url === "string" && /^https?:\/\//.test(url) ? [{ cta, url }] : []
}

// A non-empty string, or null.
function text(value) {
    return typeof value === "string" && value.trim() ? value.trim() : null
}

function flag(query, name) {
    return ["1", "true", "yes"].includes(String(query?.[name] ?? "").toLowerCase())
}

// "Jane Doe's Pro plan (€19.00/month)"
function describe(sub) {
    const who = text(sub.customer?.name) ?? text(sub.customer?.billing_name) ?? text(sub.customer?.email)
    const product = text(sub.product?.name) ?? "subscription"
    const cost = price(sub)

    return (who ? `${who}'s ${product}` : `A ${product}`) + (cost ? ` (${cost})` : "")
}

function dashboard(request, sub) {
    // ?sandbox=1 points the button at the sandbox dashboard.
    const host = flag(request.query, "sandbox") ? "https://sandbox.polar.sh" : "https://polar.sh"
    return link(`${host}/to/dashboard/sales/subscriptions/${encodeURIComponent(sub.id)}`, "View subscription")
}

function handleRequest(request) {
    const body = request.body && typeof request.body === "object" ? request.body : {}
    const sub = body.data

    // Guard: only subscription.revoked, so other Polar events on this integration stay quiet.
    if (body.type !== "subscription.revoked" || !sub || typeof sub !== "object" || !sub.id) {
        console.log(`Ignoring Polar "${typeof body.type === "string" ? body.type : "unknown"}" event`)
        return null
    }

    // Payment retries ran out: that's lost revenue rather than a planned cancellation.
    const unpaid = sub.status === "unpaid"

    return {
        title: unpaid ? "💸 Subscription ended: unpaid" : "🚪 Subscription ended",
        message: unpaid
            ? `${describe(sub)} ended after the payment retries ran out. Access was revoked.`
            : `${describe(sub)} has ended. Access was revoked.`,
        topic: "Polar",
        priority: unpaid ? 0 : -1, // Normal when payment failed, Low for a cancellation that ran out as planned
        buttons: dashboard(request, sub),
    }
}
```

## Polar subscription.revoked webhook payload (sample)

```json
{
  "data": {
    "id": "s1a2b3c4-d5e6-4f70-8a9b-0c1d2e3f4a5b",
    "amount": 1900,
    "status": "canceled",
    "ends_at": "2026-09-29T08:00:00.000000Z",
    "product": {
      "id": "p2a2b3c4-d5e6-4f70-8a9b-0c1d2e3f4a5b",
      "name": "Pro plan",
      "description": null,
      "is_archived": false,
      "is_recurring": true,
      "organization_id": "o1a2b3c4-d5e6-4f70-8a9b-0c1d2e3f4a5b",
      "recurring_interval": "month",
      "recurring_interval_count": 1
    },
    "currency": "eur",
    "customer": {
      "id": "c1a2b3c4-d5e6-4f70-8a9b-0c1d2e3f4a5b",
      "name": "Jane Doe",
      "type": "individual",
      "email": "jane@example.com",
      "billing_name": "Jane Doe",
      "email_verified": true,
      "organization_id": "o1a2b3c4-d5e6-4f70-8a9b-0c1d2e3f4a5b"
    },
    "discount": null,
    "ended_at": "2026-09-29T08:00:00.000000Z",
    "metadata": [],
    "trial_end": null,
    "created_at": "2026-06-29T08:00:00.000000Z",
    "product_id": "p2a2b3c4-d5e6-4f70-8a9b-0c1d2e3f4a5b",
    "started_at": "2026-06-29T08:00:00.000000Z",
    "canceled_at": "2026-09-02T14:12:00.000000Z",
    "checkout_id": null,
    "customer_id": "c1a2b3c4-d5e6-4f70-8a9b-0c1d2e3f4a5b",
    "discount_id": null,
    "modified_at": "2026-09-29T08:06:40.000000Z",
    "past_due_at": null,
    "trial_start": null,
    "current_period_end": "2026-09-29T08:00:00.000000Z",
    "recurring_interval": "month",
    "cancel_at_period_end": true,
    "current_period_start": "2026-08-29T08:00:00.000000Z",
    "recurring_interval_count": 1,
    "customer_cancellation_reason": "unused",
    "customer_cancellation_comment": null
  },
  "type": "subscription.revoked",
  "timestamp": "2026-09-29T08:06:40.000000Z"
}
```

## FAQ

### Does this work on iPhone and Android?

Yes. Install the JustPush app from the App Store or Google Play and sign in. Every phone signed in to your account gets the notification.

### Do I need to write code?

No. Install the recipe in Studio, paste your webhook URL into Polar and you are done. The code is there if you want to change the text, the sound or the buttons.

### Can I change what the notification says?

Yes. After install the recipe's code is yours. Edit it in Studio and test it against the sample payload before you save.

### What does it cost?

JustPush is free for 30 days. After that it's $19.99 a year, or $39.99 once. There is no extra charge for recipes.