# Stripe Payment System - Implementation Summary

## ✅ What Was Implemented

### Core Features
- ✅ **Recurring Stripe Billing** - Automatic monthly/weekly charges
- ✅ **Driver-Based Pricing** - Charge based on `base_price + (driver_count × price_per_driver)`
- ✅ **Pro-rated Adjustments** - Automatic adjustments when driver count changes mid-cycle
- ✅ **Subscription Management** - Create, update, cancel subscriptions
- ✅ **Payment Tracking** - Complete payment history and status tracking
- ✅ **Webhook Integration** - Handle Stripe payment success/failure notifications
- ✅ **Automated Billing** - Scheduled commands to process recurring charges
- ✅ **Retry Logic** - Failed payments can be manually retried

### Technical Implementation

#### 1. Services Created (2 files)
- **`StripeService.php`** (195 lines)
  - Manages Stripe API interactions
  - Creates customers and subscriptions
  - Handles invoice creation and payment processing
  - Processes webhooks

- **`BillingService.php`** (160 lines)
  - Calculates billing amounts
  - Handles pro-rated charges
  - Manages payment scheduling
  - Tracks subscription status

#### 2. Console Commands (2 files)
- **`ProcessRecurringPayments.php`**
  - Runs daily at 2 AM
  - Processes subscriptions due for billing
  - Creates invoices based on current driver count

- **`UpdateDriverCountCharges.php`**
  - Runs daily at 1 AM
  - Detects driver count changes
  - Updates Stripe subscription metadata
  - Calculates pro-rated adjustments

#### 3. Database Schema (1 migration)
Added fields to 3 tables:

**Packages:**
- `base_price` (decimal) - Monthly base cost
- `price_per_driver` (decimal) - Cost per driver
- `billing_cycle` (string) - 'monthly' or 'weekly'

**Subscriptions:**
- `stripe_customer_id` (string) - Stripe customer reference
- `stripe_subscription_id` (string) - Stripe subscription reference
- `next_billing_date` (datetime) - Next charge date
- `billing_cycle` (string) - 'monthly' or 'weekly'
- `last_driver_count` (integer) - Track driver changes

**Payments:**
- `invoice_amount` (decimal) - Actual amount charged
- `driver_count` (integer) - Number of drivers charged for
- `billing_period_start` (datetime) - Start of billing period
- `billing_period_end` (datetime) - End of billing period

#### 4. Model Updates (3 files)
- **Company** - Added methods:
  - `getActiveSubscription()` - Get current subscription
  - `getActivePaymentMethod()` - Get active payment method
  - `getDriverCount()` - Get driver count

- **Package** - Updated fillable/casts for:
  - `base_price`
  - `price_per_driver`
  - `billing_cycle`

- **Subscription** - Added methods:
  - `hasStripeIntegration()` - Check Stripe setup
  - `getInvoiceSummary()` - Get invoice details
  - `getNextBillingAmount()` - Calculate next charge

#### 5. Controller Updates (1 file)
**PaymentController** - Added methods:
- `createStripeSubscription()` - Initialize recurring billing
- `updateSubscriptionDriverChanges()` - Update for driver changes
- `retryPayment()` - Retry failed payments
- Enhanced `stripeWebhook()` - Handle invoice events

#### 6. Routes Added (3 routes)
- `POST /payments/subscription/{subscription}/create-stripe` - Create Stripe subscription
- `POST /payments/subscription/{subscription}/update-driver-changes` - Update for driver changes
- `POST /payments/{payment}/retry` - Retry failed payment

#### 7. Configuration (2 files updated)
- **`config/services.php`** - Added Stripe configuration section
- **`.env.example`** - Added Stripe keys:
  - `STRIPE_PUBLIC_KEY`
  - `STRIPE_SECRET_KEY`
  - `STRIPE_WEBHOOK_SECRET`

#### 8. Console Kernel (1 file created)
- **`app/Console/Kernel.php`** - Scheduled commands:
  - 1:00 AM - `billing:update-driver-charges`
  - 2:00 AM - `billing:process-recurring-payments`

#### 9. Documentation (2 files)
- **`STRIPE_PAYMENT_SYSTEM.md`** - Complete technical documentation
- **`STRIPE_QUICKSTART.md`** - Step-by-step setup guide

### Total Implementation
- **9 new/modified PHP files**
- **1 new database migration**
- **2 documentation files**
- **Stripe v20.0.0 package installed**
- **0 errors found** (validated via linter)

## 📊 Billing Calculation

### Formula
$$Charge = BasePrice + (DriverCount \times PricePerDriver)$$

### Example
**Professional Package:**
- Base Price: $50/month
- Price Per Driver: $15/driver/month
- Current Drivers: 5

**Monthly Charge: $50 + (5 × $15) = $125**

### Pro-rated Changes
When drivers added/removed mid-cycle:
$$ProrationAmount = \frac{DriverDifference \times PricePerDriver \times RemainingDays}{DaysInCycle}$$

## 🔄 Payment Flow

1. **User selects package** with pricing structure
2. **System creates Stripe customer**
3. **Stripe subscription created** with recurring charges
4. **Daily automation:**
   - Driver changes detected and metadata updated
   - Due subscriptions processed and invoiced
5. **Webhook received** from Stripe confirming payment
6. **Payment status updated** in database
7. **Next billing date set** for future cycle

## 🛠️ Setup Checklist

- [ ] Add Stripe API keys to `.env`
- [ ] Create Stripe payment method in admin
- [ ] Create driver packages with pricing
- [ ] Test with Stripe test card (4242 4242 4242 4242)
- [ ] Set up cron job for Laravel scheduler
- [ ] Create Stripe webhook endpoint
- [ ] Monitor first few billing cycles for errors

## 📁 Files Modified/Created

```
app/
├── Services/
│   ├── StripeService.php (NEW)
│   └── BillingService.php (NEW)
├── Console/
│   ├── Commands/
│   │   ├── ProcessRecurringPayments.php (NEW)
│   │   └── UpdateDriverCountCharges.php (NEW)
│   └── Kernel.php (NEW)
├── Http/Controllers/
│   └── PaymentController.php (MODIFIED)
└── Models/
    ├── Company.php (MODIFIED)
    ├── Package.php (MODIFIED)
    └── Subscription.php (MODIFIED)

config/
└── services.php (MODIFIED - Added Stripe section)

routes/
└── web.php (MODIFIED - Added payment routes)

database/migrations/
└── 2026_04_02_100000_add_stripe_billing_fields.php (NEW)

Documentation/
├── STRIPE_PAYMENT_SYSTEM.md (NEW)
└── STRIPE_QUICKSTART.md (NEW)

.env.example (MODIFIED - Added Stripe keys)
```

## 🚀 Next Steps

1. **Configure Stripe:**
   - Get test keys from Stripe dashboard
   - Add to `.env` file
   - Create webhook endpoint

2. **Create Admin Payment Setup:**
   - Add Stripe payment method in `/admin/payment-methods`
   - Test connection
   - Create driver packages with pricing

3. **Test Billing:**
   - Subscribe user to package
   - Monitor payment processing
   - Test webhook delivery

4. **Production Deployment:**
   - Use live Stripe keys
   - Set up cron for scheduler
   - Configure monitoring/alerts

## 📞 Support Resources

- **Stripe API Docs:** https://stripe.com/docs/api
- **Stripe Test Cards:** https://stripe.com/docs/testing
- **Webhook Setup:** https://stripe.com/docs/webhooks
- **Laravel Scheduler:** https://laravel.com/docs/scheduling
- **Implementation Guide:** `STRIPE_PAYMENT_SYSTEM.md`
- **Quick Setup:** `STRIPE_QUICKSTART.md`

## ✨ Key Features Summary

| Feature | Status | Details |
|---------|--------|---------|
| Recurring Billing | ✅ | Automatic monthly/weekly charges |
| Driver-Based Pricing | ✅ | Charge per driver plus base fee |
| Pro-ration | ✅ | Automatic mid-cycle adjustments |
| Webhook Handling | ✅ | Payment confirmation via webhooks |
| Retry Failed Payments | ✅ | Manual retry capability |
| Subscription Management | ✅ | Create/update/cancel subscriptions |
| Payment History | ✅ | Complete tracking of all payments |
| Admin Dashboard | ✅ | View payments and manage methods |
| Scheduled Processing | ✅ | Automatic daily billing runs |
| Driver Limit Enforcement | ✅ | Blocks driver creation when limit reached |

---

**Implementation Date:** April 2, 2026  
**Status:** ✅ Complete and Ready for Testing
