585 lines
20 KiB
Markdown
585 lines
20 KiB
Markdown
# Payment Failure Handling - Complete Documentation
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## 🎯 Critical Issues
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### Issue 1: Failed Cards Creating Active Subscriptions
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**Failed payment cards (4000000000000341) were creating active subscriptions with partial discount coupons (50% off), causing revenue loss.**
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### Issue 2: Multiple Subscriptions with 3DS Cards
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**When creating package + addon subscriptions with same 3DS card:**
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- Each subscription requires its own 3DS authentication
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- **This is expected Stripe behavior** - each PaymentIntent is independent
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- User sees multiple 3DS popups (one per subscription)
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- Frequency: <2% of checkouts (most cards don't require 3DS)
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**Updated Recommendation (January 16, 2026)**: Accept multiple popups - don't over-engineer for rare edge case.
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---
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## 📋 Solutions Overview
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### Solution 1: Direct Subscription Pattern (Recommended)
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Handle 3DS authentication during subscription creation:
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- `payment_behavior: 'default_incomplete'` - Allows 3DS authentication flow
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- Manual invoice finalization and payment confirmation
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- 3DS detection via `handleSubscriptionPayment()` helper
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- Return `client_secret` to frontend when 3DS required
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- Subscription cleanup on payment failure
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- **Accept multiple 3DS popups for multiple subscriptions** (rare scenario)
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**Status**: ✅ **Completed** (Updated January 16, 2026 for 3DS support)
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**When to Use**:
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- ✅ Creating subscriptions with immediate charge (no trial)
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- ✅ Upgrading/downgrading existing subscription
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- ✅ Package + addon creation with immediate billing
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- ✅ Any scenario where first payment happens NOW
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### Solution 2: Setup Intent Pattern (For Future Charges Only)
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Pre-authenticate payment methods for **future off-session payments** using Stripe SetupIntent API.
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**Status**: ✅ **Completed** - See [Setup Intent Pattern](#setup-intent-pattern) section
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**When to Use**:
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- ✅ Reactivating subscription with new card (cancel_at_period_end=false)
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- ✅ Adding payment method during trial period (no immediate charge)
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- ✅ Changing payment method on active subscription (next charge is future)
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- ✅ Pre-validating card for scheduled billing
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**⚠️ DO NOT Use For**:
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- ❌ Creating subscription with immediate charge (causes double authentication)
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- ❌ Multiple subscriptions with immediate billing (not a solution for multiple 3DS)
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---
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## 🔐 Setup Intent Pattern
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### Purpose
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**SetupIntent** is Stripe's API for authenticating payment methods for **future off-session payments** WITHOUT charging them NOW.
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### Use Cases
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#### ✅ Scenario 1: Reactivating Subscription with New Card
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User has subscription with `cancel_at_period_end=true` and wants to:
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1. Update to `cancel_at_period_end=false` (reactivate)
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2. Use a NEW payment method that requires 3DS
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**Challenge**: Subscription is already active (no immediate charge), but new card needs authentication for FUTURE recurring charges.
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**Solution**: Use Setup Intent to pre-authenticate without charging.
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```
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Setup Intent Flow:
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┌─────────────────────────────────────────┐
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│ 1. Setup Card (Pre-authenticate) │
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│ └─> Trigger 3DS popup (if needed) │
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│ 2. Update subscription settings │
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│ └─> cancel_at_period_end = false │
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│ 3. Next billing cycle │
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│ └─> Auto-charge (no popup) │
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└─────────────────────────────────────────┘
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Result: Card authenticated for future use ✅
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```
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#### ✅ Scenario 2: Trial Period with New Card
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User starts subscription with trial period:
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- No immediate charge (trial active)
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- Card needs validation for future billing
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**Solution**: Use Setup Intent to validate card without charging.
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#### ❌ NOT For: Multiple Subscriptions with Immediate Charge
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**Previous Misconception**: Use Setup Intent to avoid multiple 3DS popups when creating package + addons.
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**Reality (Confirmed January 16, 2026)**:
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- Setup Intent authenticates for **future off-session payments**
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- First payment is **on-session** → still requires 3DS
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- Results in **double authentication**: Setup Intent 3DS + Payment 3DS
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- **Worse UX** than accepting multiple popups
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**Correct Approach**: Accept that each subscription requires its own 3DS (rare scenario <2%).
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### Backend Implementation
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**New Endpoint**: `POST /api/subscription/setupCard`
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**Location**: [controllers/subscription.js](../controllers/subscription.js#L769)
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**Code**:
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```javascript
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async function setupCardAuthentication_post(req, res) {
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const { custId, pmId } = req.body;
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// Validate parameters
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if (!custId || !pmId) {
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throw new AppParamError(Errors.INVALID_PARAM, 'custId and pmId are required');
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}
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// Create SetupIntent to pre-authenticate card
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const setupIntent = await stripe.setupIntents.create({
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customer: custId,
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payment_method: pmId,
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usage: 'off_session', // For future charges without customer present
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confirm: true,
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return_url: `${env.SITE_URL}/subscription/setup-complete`
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});
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// If 3DS required, return client_secret for frontend
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if (setupIntent.status === 'requires_action') {
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return res.json({
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requiresAction: true,
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clientSecret: setupIntent.client_secret,
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setupIntentId: setupIntent.id,
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status: setupIntent.status,
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message: 'Card authentication required'
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});
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}
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// Card authenticated successfully
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return res.json({
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requiresAction: false,
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status: setupIntent.status,
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setupIntentId: setupIntent.id,
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message: 'Card authenticated successfully'
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});
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}
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```
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**Route**: Added to [routes/subscription.js](../routes/subscription.js)
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```javascript
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router.post('/setupCard', memberCtl.setupCardAuthentication_post);
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```
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### Frontend Implementation
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**Example: Reactivating Subscription with New Card**
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**Step 1: Pre-authenticate new card**
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```typescript
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// User wants to reactivate subscription with new card
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const setupResult = await api.setupCard(custId, newPmId);
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// Handle 3DS if required
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if (setupResult.requiresAction) {
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const setupIntent = await stripe.confirmCardSetup(setupResult.clientSecret);
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if (setupIntent.status !== 'succeeded') {
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throw new Error('Authentication failed');
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}
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}
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```
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**Step 2: Update subscription settings**
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```typescript
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// Card is authenticated for future billing
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// Now reactivate subscription (no immediate charge)
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const result = await api.updateSubscriptionSettings({
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cancel_at_period_end: false,
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default_payment_method: newPmId // Already authenticated for future
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});
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```
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**Complete Flow**:
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```typescript
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async reactivateWithNewCard(newPmId: string) {
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try {
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// 1. Authenticate card for FUTURE charges (no charge now)
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this.loadingMessage = 'Verifying payment method...';
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const setup = await this.subscriptionService.setupCard(this.custId, newPmId).toPromise();
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// 2. Handle 3DS if needed
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if (setup.requiresAction) {
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this.loadingMessage = 'Please complete authentication...';
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const result = await this.stripeService.confirmCardSetup(setup.clientSecret);
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if (result.status !== 'succeeded') {
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throw new Error('Authentication failed');
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}
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}
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// 3. Reactivate subscription (no charge, no additional 3DS)
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this.loadingMessage = 'Reactivating subscription...';
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await this.subscriptionService.updateSettings({
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cancel_at_period_end: false,
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default_payment_method: newPmId
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}).toPromise();
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// Success!
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this.showSuccess('Subscription reactivated! Next billing will use new card.');
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} catch (error) {
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this.handleError(error);
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}
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}
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```
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**Note**: This is for reactivation ONLY. For new subscriptions with immediate charge, use Direct Subscription Pattern (see FRONTEND_3DS_IMPLEMENTATION.md).
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### Benefits
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✅ **Pre-validates card**: Checks card before billing cycle
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✅ **Future-proof**: Authenticated for recurring payments without popup
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✅ **SCA Compliant**: Meets Strong Customer Authentication requirements
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✅ **No immediate charge**: Perfect for trials and reactivations
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### When to Use Setup Intent
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**✅ Use Setup Intent Pattern when**:
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- Reactivating subscription with new card (cancel_at_period_end=false)
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- Adding payment method during trial (no immediate charge)
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- Changing default payment method (future billing)
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- Pre-validating card for scheduled payments
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**❌ DO NOT use Setup Intent when**:
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- Creating subscription with immediate charge
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- Upgrading/downgrading (immediate payment)
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- Any scenario requiring payment NOW
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### Comparison Table
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| Aspect | Direct Subscription | Setup Intent Pattern |
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|--------|---------------------|----------------------|
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| **Charge Timing** | Immediate (NOW) | Future (off-session) |
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| **3DS Timing** | During subscription creation | Before subscription creation |
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| **Best For** | Immediate billing | Trial periods, reactivation |
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| **Prevents Multiple 3DS?** | ❌ No (and not needed) | ❌ No (not designed for this) |
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| **Complexity** | Lower | Higher |
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| **Use Case Frequency** | ⭐⭐⭐⭐⭐ Common | ⭐⭐ Rare |
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| **User Experience** | ⭐⭐⭐⭐ Direct | ⭐⭐⭐⭐ Clear intent |
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### Testing
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```bash
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# Test Setup Intent with 3DS card
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curl -X POST http://localhost:4100/api/subscription/setupCard \
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-H "Content-Type: application/json" \
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-H "Authorization: Bearer <token>" \
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-d '{"custId":"cus_xxx","pmId":"pm_card_threeDSecure"}'
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# Expected: requiresAction: true, clientSecret present
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```
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**Test Cards**:
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- `4242424242424242` - No 3DS, immediate success
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- `4000000000003220` - 3DS required, tests authentication flow
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- `4000000000000341` - Always fails, tests error handling
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### Documentation
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Complete implementation guide: [FRONTEND_3DS_IMPLEMENTATION.md](FRONTEND_3DS_IMPLEMENTATION.md#setup-intent-pattern)
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---
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## 🔍 Payment Verification (Original Issue)
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### Root Cause Analysis
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This bug required **three separate fixes** to fully resolve:
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### Fix 1: Payment Behavior Parameter
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Direct subscriptions needed proper `payment_behavior` setting to handle both payment failures AND 3DS authentication.
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**Initial Solution (Jan 8, 2026)**: Used `payment_behavior: 'error_if_incomplete'` to force incomplete status on payment failure.
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**Updated Solution (Jan 16, 2026)**: Changed to `payment_behavior: 'default_incomplete'` to support 3DS authentication:
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- Failed payments still result in `incomplete` status ✓
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- 3DS cards return `requires_action` status (not an error) ✓
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- Frontend can handle 3DS authentication ✓
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- After 3DS completion, Stripe automatically charges and activates subscription ✓
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### Fix 2: SubscriptionSchedules Create Draft Invoices
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When subscriptions are created via `SubscriptionSchedule` (for promotional coupons with expiry dates):
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- Invoices are created in `draft` status
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- No payment attempt is made automatically
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- Subscription becomes `active` without payment
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- The `payment_behavior` parameter is ignored by SubscriptionSchedules
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**Solution**: Added invoice finalization and payment verification logic.
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### Fix 3: Payment Intent Never Confirmed (CRITICAL - Final Fix)
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**The root cause**: After finalizing the invoice, the payment intent status was `requires_confirmation`. Without calling `stripe.paymentIntents.confirm()`, the charge was NEVER attempted and failed cards stayed in limbo.
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**Stripe PaymentIntent Workflow**:
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```
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draft invoice → finalize → PaymentIntent (requires_confirmation)
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↓
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[CONFIRM] ← THIS WAS MISSING!
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↓
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Valid card → succeeded
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Failed card → requires_payment_method (declined)
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```
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---
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## ✅ The Solution
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### Code Changes
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**File**: `controllers/subscription.js`
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**Location 1: Line ~2088** - Direct Subscription Payment Behavior (Updated for 3DS)
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```javascript
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let params = {
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metadata: { type: type },
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cancel_at_period_end: true,
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expand: ['latest_invoice.payment_intent'],
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// CRITICAL: Support both payment failures AND 3DS authentication
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payment_behavior: 'default_incomplete' // Changed from 'error_if_incomplete'
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};
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// After subscription creation, check if 3DS required
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const handledSub = await handleSubscriptionPayment(subscription);
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// If 3DS needed, returns { requiresAction: true, client_secret, ... }
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// Frontend handles 3DS, Stripe auto-charges after authentication
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```
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**Location 2: Line ~1480** - Payment Intent Confirmation After Invoice Finalization
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```javascript
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// After finalizing invoice, retrieve and confirm payment intent
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let pi = finalizedInvoice.payment_intent
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? (typeof finalizedInvoice.payment_intent === 'string'
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? await stripe.paymentIntents.retrieve(finalizedInvoice.payment_intent)
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: finalizedInvoice.payment_intent)
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: null;
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let piStatus = pi?.status;
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debug(`Payment intent initial status: ${piStatus}`);
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// CRITICAL FIX: Confirm payment intent to trigger actual charge attempt
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if (piStatus === 'requires_confirmation' && pi) {
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debug(`Confirming payment intent ${pi.id} to trigger payment attempt...`);
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try {
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pi = await stripe.paymentIntents.confirm(pi.id);
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piStatus = pi.status;
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debug(`Payment intent confirmed, new status: ${piStatus}`);
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} catch (confirmErr) {
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debug(`Payment intent confirmation failed: ${confirmErr.message}`);
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piStatus = 'requires_payment_method';
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}
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}
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// Only fail on actual payment failures
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if (piStatus === 'requires_payment_method') {
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debug(`Payment failed for subscription ${subscription.id}, canceling`);
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// Void invoice and delete subscription
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try {
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if (finalizedInvoice.status === 'open') {
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await stripe.invoices.voidInvoice(finalizedInvoice.id);
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}
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} catch (voidErr) {
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debug(`Failed to void invoice: ${voidErr.message}`);
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}
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try {
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await stripe.subscriptions.del(subscription.id);
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} catch (delErr) {
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if (delErr.code !== 'resource_missing') {
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debug(`Failed to delete subscription: ${delErr.message}`);
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}
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}
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throw new AppMembershipError(Errors.PAYMENT_FAILED,
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'Payment failed. Please update your payment method and try again.');
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}
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```
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**Location 3: Line ~1542** - Same Fix for Open Invoices
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```javascript
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else if (invoice.status === 'open' && invoice.amount_due > 0) {
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let pi = invoice.payment_intent
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? (typeof invoice.payment_intent === 'string'
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? await stripe.paymentIntents.retrieve(invoice.payment_intent)
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: invoice.payment_intent)
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: null;
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let piStatus = pi?.status;
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// CRITICAL FIX: Confirm payment intent
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if (piStatus === 'requires_confirmation' && pi) {
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try {
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pi = await stripe.paymentIntents.confirm(pi.id);
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piStatus = pi.status;
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} catch (confirmErr) {
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piStatus = 'requires_payment_method';
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}
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}
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// Only fail if payment explicitly failed
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if (piStatus === 'requires_payment_method') {
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await stripe.subscriptions.del(subscription.id);
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throw new AppMembershipError(Errors.PAYMENT_FAILED,
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'Payment failed. Please update your payment method and try again.');
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}
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}
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```
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---
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## 🧪 Test Results
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### Test 1: Failed Card (4000000000000341)
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```
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✅ Customer created
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✅ Schedule created with 50% coupon
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📃 Invoice status: draft
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⚙️ Finalizing invoice...
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📊 Payment Intent: requires_confirmation
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⚙️ Confirming payment intent...
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❌ Payment confirmation failed: Your card was declined
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Updated Status: requires_payment_method
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✅ CORRECT: Payment failed, subscription deleted
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```
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### Test 2: Valid Card (4242424242424242)
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```
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✅ Customer created
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✅ Schedule created with 50% coupon
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📃 Invoice status: draft
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⚙️ Finalizing invoice...
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📊 Payment Intent: requires_confirmation
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⚙️ Confirming payment intent...
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✅ Payment confirmed: succeeded
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✅ CORRECT: Subscription remains active
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```
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### Test 3: 3D Secure Card (4000000000003220)
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**Updated Behavior (After Fix)**:
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```
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✅ Customer created
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✅ Schedule created with 50% coupon
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📃 Invoice status: draft
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⚙️ Finalizing invoice...
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📊 Payment Intent: requires_confirmation
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⚙️ Confirming payment intent with return_url...
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📊 Payment requires action (3DS)
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📤 Returning client_secret to frontend
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✅ CORRECT: Frontend receives requires_action flag + client_secret
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```
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**Frontend Flow**:
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1. Backend returns: `{ (subscription info: id,customer,status,items,current_period_start,current_period_end..), requires_action: true, client_secret: "pi_xxx_secret_xxx" }`
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2. Frontend uses Stripe.js: `stripe.confirmCardPayment(client_secret)` (Note: Use confirmCardPayment, NOT handleCardAction)
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3. Customer completes 3DS authentication in popup
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4. **CRITICAL**: After 3DS completes, subscription is STILL 'incomplete'
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5. **Frontend MUST poll** `GET /api/subscription/status/:subscriptionId` to detect activation
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6. Stripe auto-charges in background (1-5 seconds)
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7. Subscription becomes `active` after successful charge
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8. Show success message to user
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**⚠️ Common Mistake**: Assuming `confirmCardPayment()` success means subscription is active. It doesn't! Must poll.
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**Error Handling**: If server-side confirmation throws an error for 3DS cards, the code now:
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- Catches authentication-related errors
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- Re-fetches payment intent to get actual status
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- Returns `client_secret` if status is `requires_action`
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- Only treats as failure if truly declined (not 3DS)
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**Key Fix**: Added `return_url` parameter to `stripe.paymentIntents.confirm()` to prevent Stripe from throwing errors on 3DS cards. Also added error handling to catch authentication errors and return `client_secret` to frontend.
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---
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## 📊 Payment Intent Status Reference
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| Status | Meaning | Action |
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|--------|---------|--------|
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| `requires_confirmation` | Needs confirm() call | **Confirm it** |
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| `requires_payment_method` | Payment failed | **Delete + error** |
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| `requires_action` | 3D Secure needed | **Allow** |
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| `processing` | Payment processing | **Allow** |
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| `succeeded` | Payment successful | **Allow** |
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---
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## 📁 Files Modified
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- `controllers/subscription.js` (3 locations)
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- `test_payment_confirmation.js` - Failed card test
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- `test_valid_card_confirmation.js` - Valid card test
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---
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## 🚀 Deployment Checklist
|
||
|
||
- [x] Code implemented
|
||
- [x] Tests passing
|
||
- [x] Documentation complete
|
||
- [ ] User testing via frontend
|
||
- [ ] Production deployment
|
||
- [ ] Monitor error logs
|
||
|
||
---
|
||
|
||
## 🔑 Key Learning
|
||
|
||
**Stripe PaymentIntent requires explicit confirmation**:
|
||
- `requires_confirmation` is NOT a final state
|
||
- Must call `.confirm()` to trigger charge for regular cards
|
||
- Failed cards won't automatically become `requires_payment_method`
|
||
|
||
**3D Secure (3DS) Cards**:
|
||
- ⚠️ Should NOT be confirmed server-side
|
||
- Require client-side authentication flow with Stripe.js
|
||
- Server-side confirmation will return `requires_action` but customer can't complete auth
|
||
- This causes subscriptions to be created with `past_due` or `incomplete` status
|
||
- **Solution**: Return `client_secret` to frontend for 3DS handling
|
||
|
||
---
|
||
|
||
## 🎯 Success Criteria
|
||
|
||
- ❌ Card `4000000000000341` with 50% coupon → Payment fails ✅ WORKING
|
||
- ✅ Card `4242424242424242` with 50% coupon → Subscription created ✅ WORKING
|
||
- ⚠️ Card `4000000000003220` (3DS) → Needs client-side handling ⚠️ LIMITATION
|
||
- ✅ No false positives (valid cards rejected) ✅ WORKING
|
||
|
||
---
|
||
|
||
## 🐛 Troubleshooting
|
||
|
||
### Valid Cards Failing
|
||
- Check server logs for payment intent status
|
||
- Verify Stripe API key
|
||
- Check webhook interference
|
||
|
||
### Failed Cards Creating Subscriptions
|
||
- Verify server restarted with new code
|
||
- Check debug logs for "Confirming payment intent"
|
||
- Enable debug: `DEBUG=agm:*`
|
||
|
||
### 3DS Cards Creating Subscriptions with `past_due` Status
|
||
- **This is expected with current server-side confirmation**
|
||
- 3DS requires customer authentication on client-side
|
||
- Server-side confirmation returns `requires_action` which we allow
|
||
- Subscription created but payment incomplete → `past_due` status
|
||
- **Workaround**: Use cards without 3DS for testing, or implement client-side 3DS flow
|
||
- **Proper Fix**: Detect `requires_action` and return `client_secret` to frontend
|
||
|
||
---
|
||
|
||
## 📚 Additional Resources
|
||
|
||
- Stripe PaymentIntents API: https://stripe.com/docs/api/payment_intents
|
||
- Stripe Test Cards: https://stripe.com/docs/testing#cards
|
||
- Subscription Schedules: https://stripe.com/docs/billing/subscriptions/subscription-schedules
|
||
|
||
---
|
||
|
||
## 📝 Revision History
|
||
|
||
| Date | Version | Changes |
|
||
|------|---------|---------|
|
||
| 2024-02-08 | v1.0 | Initial payment_behavior fix |
|
||
| 2024-02-08 | v2.0 | Added invoice finalization |
|
||
| 2024-02-09 | v3.0 | Added payment intent confirmation (final fix) |
|