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.opencode/skills/payment-integration/references/polar/subscriptions.md

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+# Polar Subscriptions
+
+Subscription lifecycle, upgrades, downgrades, and trial management.
+
+## Lifecycle States
+
+- `created` - New subscription, payment pending
+- `active` - Payment successful, benefits granted
+- `canceled` - Scheduled cancellation at period end
+- `revoked` - Billing stopped, benefits revoked immediately
+- `past_due` - Payment failed, in dunning period
+
+## API Operations
+
+### List Subscriptions
+```typescript
+const subscriptions = await polar.subscriptions.list({
+  organization_id: "org_xxx",
+  product_id: "prod_xxx",
+  customer_id: "cust_xxx",
+  status: "active"
+});
+```
+
+### Get Subscription
+```typescript
+const subscription = await polar.subscriptions.get(subscriptionId);
+```
+
+### Update Subscription
+```typescript
+const updated = await polar.subscriptions.update(subscriptionId, {
+  product_price_id: "newPriceId",
+  discount_id: "discount_xxx",
+  metadata: { plan: "pro" }
+});
+```
+
+## Upgrades & Downgrades
+
+### Proration Options
+
+**Next Invoice (default):**
+- Credit/charge applied to upcoming invoice
+- Subscription updates immediately
+- Customer billed at next cycle
+
+**Invoice Immediately:**
+- Credit/charge processed right away
+- Subscription updates immediately
+- New invoice generated
+
+```typescript
+await polar.subscriptions.update(subscriptionId, {
+  product_price_id: "higher_tier_price",
+  proration: "invoice_immediately" // or "next_invoice"
+});
+```
+
+### Customer-Initiated Changes
+
+**Enable in Product Settings:**
+- Toggle "Allow price change"
+- Customer can upgrade/downgrade via portal
+- Admin-only changes if disabled
+
+**Implementation:**
+```typescript
+// Check if changes allowed
+const product = await polar.products.get(productId);
+if (product.allow_price_change) {
+  // Customer can change via portal
+}
+```
+
+## Trials
+
+### Configuration
+
+**Product-level:**
+```typescript
+const product = await polar.products.create({
+  name: "Pro Plan",
+  prices: [{
+    trial_period_days: 14
+  }]
+});
+```
+
+**Checkout-level:**
+```typescript
+const session = await polar.checkouts.create({
+  product_price_id: "price_xxx",
+  trial_period_days: 7 // Overrides product setting
+});
+```
+
+### Trial Behavior
+- Customer not charged during trial
+- Benefits granted immediately
+- Can cancel anytime during trial
+- Charged at trial end if not canceled
+
+### Trial Events
+```typescript
+// Listen to webhooks
+subscription.created // Trial starts
+subscription.active // Trial ends, first charge
+subscription.canceled // Trial canceled
+```
+
+## Cancellations
+
+### Cancel at Period End
+```typescript
+await polar.subscriptions.update(subscriptionId, {
+  cancel_at_period_end: true
+});
+// Subscription remains active
+// Benefits continue until period end
+// Webhooks: subscription.updated, subscription.canceled
+```
+
+### Immediate Revocation
+```typescript
+// Happens automatically at period end
+// Or manually via API (future feature)
+// Status changes to "revoked"
+// Billing stops, benefits revoked
+// Webhooks: subscription.updated, subscription.revoked
+```
+
+### Reactivate Canceled
+```typescript
+await polar.subscriptions.update(subscriptionId, {
+  cancel_at_period_end: false
+});
+// Removes cancellation
+// Subscription continues normally
+```
+
+## Renewals
+
+### Listening to Renewals
+```typescript
+app.post('/webhook/polar', async (req, res) => {
+  const event = validateEvent(req.body, req.headers, secret);
+
+  if (event.type === 'order.created') {
+    const order = event.data;
+
+    if (order.billing_reason === 'subscription_cycle') {
+      // This is a renewal
+      await handleRenewal(order.subscription_id);
+    }
+  }
+
+  res.json({ received: true });
+});
+```
+
+### Failed Renewals
+- `subscription.past_due` webhook fired
+- Dunning process initiated
+- Customer notified via email
+- Multiple retry attempts
+- Eventually revoked if payment fails
+
+## Discounts
+
+### Apply Discount
+```typescript
+await polar.subscriptions.update(subscriptionId, {
+  discount_id: "discount_xxx"
+});
+```
+
+### Remove Discount
+```typescript
+await polar.subscriptions.update(subscriptionId, {
+  discount_id: null
+});
+```
+
+### Discount Types
+- Percentage off: 20% off
+- Fixed amount: $5 off
+- Duration: once, forever, repeating
+
+## Customer Portal
+
+### Generate Portal Access
+```typescript
+const session = await polar.customerSessions.create({
+  customer_id: "cust_xxx"
+});
+
+// Redirect to: session.url
+```
+
+### Portal Features
+- View subscriptions
+- Upgrade/downgrade plans
+- Cancel subscriptions
+- Update billing info
+- View invoices
+- Access benefits
+
+### Pre-authenticated Links
+```typescript
+// From your app, create session and redirect
+app.get('/portal', async (req, res) => {
+  const session = await polar.customerSessions.create({
+    external_customer_id: req.user.id
+  });
+
+  res.redirect(session.url);
+});
+```
+
+## Metadata
+
+### Update Subscription Metadata
+```typescript
+await polar.subscriptions.update(subscriptionId, {
+  metadata: {
+    internal_id: "sub_123",
+    tier: "pro",
+    source: "web"
+  }
+});
+```
+
+### Query by Metadata
+```typescript
+const subscriptions = await polar.subscriptions.list({
+  organization_id: "org_xxx",
+  metadata: { tier: "pro" }
+});
+```
+
+## Best Practices
+
+1. **Lifecycle Management:**
+   - Listen to all subscription webhooks
+   - Handle each state appropriately
+   - Sync state to your database
+   - Grant/revoke access based on state
+
+2. **Upgrades/Downgrades:**
+   - Use proration for fair billing
+   - Communicate changes clearly
+   - Preview invoice before change
+   - Allow customer self-service
+
+3. **Trials:**
+   - Set appropriate trial duration
+   - Notify before trial ends
+   - Easy cancellation during trial
+   - Clear trial end date in UI
+
+4. **Cancellations:**
+   - Make cancellation easy
+   - Offer alternatives (pause, downgrade)
+   - Collect feedback
+   - Keep benefits until period end
+   - Send confirmation email
+
+5. **Failed Payments:**
+   - Handle `past_due` webhook
+   - Notify customer promptly
+   - Provide retry mechanism
+   - Grace period before revocation
+   - Clear reactivation path
+
+6. **Customer Communication:**
+   - Renewal reminders
+   - Payment confirmations
+   - Failed payment notifications
+   - Upgrade/downgrade confirmations
+   - Cancellation confirmations
+
+7. **Analytics:**
+   - Track churn reasons
+   - Monitor upgrade/downgrade patterns
+   - Analyze trial conversion
+   - Measure payment failure rates
+   - Lifetime value calculations
+
+## Common Patterns
+
+### Subscription Status Check
+```typescript
+async function hasActiveSubscription(userId) {
+  const subscriptions = await polar.subscriptions.list({
+    external_customer_id: userId,
+    status: "active"
+  });
+
+  return subscriptions.items.length > 0;
+}
+```
+
+### Grace Period Handler
+```typescript
+app.post('/webhook/polar', async (req, res) => {
+  const event = validateEvent(req.body, req.headers, secret);
+
+  if (event.type === 'subscription.past_due') {
+    const subscription = event.data;
+
+    // Grant 3-day grace period
+    await grantGracePeriod(subscription.customer_id, 3);
+
+    // Notify customer
+    await sendPaymentFailedEmail(subscription.customer_id);
+  }
+
+  res.json({ received: true });
+});
+```
+
+### Upgrade Path
+```typescript
+async function upgradeSubscription(subscriptionId, newPriceId) {
+  // Preview invoice
+  const preview = await polar.subscriptions.previewUpdate(subscriptionId, {
+    product_price_id: newPriceId,
+    proration: "invoice_immediately"
+  });
+
+  // Show customer preview
+  if (await confirmUpgrade(preview)) {
+    await polar.subscriptions.update(subscriptionId, {
+      product_price_id: newPriceId,
+      proration: "invoice_immediately"
+    });
+  }
+}
+```