# PayFast Package - Complete Implementation Summary

## Completed Features

### 1. Test Suite Migration

- Tests moved to `packages/zfhassaan/payfast/tests/`
- Package-level `phpunit.xml` created
- Test base class with proper setup
- All tests organized in Unit and Feature directories

### 2. Audit Logging System

- `ActivityLog` model created
- `ActivityLogRepository` with interface (Repository Pattern)
- Logs all payment activities (initiated, validated, completed, failed)
- Stores user_id, transaction_id, order_no, status, amount, details, metadata

### 3. Transaction Logging (IPN)

- `IPNLog` model created
- `IPNLogRepository` with interface (Repository Pattern)
- Stores Instant Payment Notifications from PayFast
- Tracks transaction status, amount, currency, details

### 4. Email Notification System

- `EmailNotificationService` with interface (Dependency Inversion)
- Sends payment status notifications to customers
- Sends payment completion emails to customers
- Sends admin notification emails
- Sends payment failure emails
- Configurable email templates (publishable)
- Configurable email subjects
- Admin emails from `.env` (PAYFAST_ADMIN_EMAILS)

### 5. Console Command Enhancements

- Updated `CABPayments` command with:
- Status updates when payment is completed
- Activity logging for all transactions
- Email notifications to customers and admins
- `--no-email` option to skip emails
- Better error handling and reporting
- Command is publishable and customizable
- Stub file for easy customization

### 6. Event Listeners

- `LogPaymentActivity` - Logs all payment events
- `SendPaymentEmailNotifications` - Sends emails on payment events
- `StorePaymentRecord` - Stores payment records

### 7. Publishable Resources

- Email templates (publishable to `resources/views/vendor/payfast/emails`)
- Console command stub (publishable to `app/Console/Commands`)
- Config file (publishable to `config/payfast.php`)
- Migrations (publishable to `database/migrations`)

### 8. Architecture Implementation

#### Single Responsibility Principle (SRP)

- Each service has one responsibility:
- `AuthenticationService` - Token management only
- `PaymentService` - Payment processing only
- `TransactionService` - Transaction queries only
- `EmailNotificationService` - Email sending only
- `OTPVerificationService` - OTP handling only
- Each repository handles one entity
- Each listener handles one event type

#### Open/Closed Principle (OCP)

- Services are open for extension via interfaces
- Email templates can be customized (published)
- Console command can be extended (published stub)
- Event listeners can be added without modifying core

#### Liskov Substitution Principle (LSP)

- All implementations can be substituted with their interfaces
- Repository implementations are interchangeable

#### Interface Segregation Principle (ISP)

- Small, focused interfaces
- Services don't depend on methods they don't use

#### Dependency Inversion Principle (DIP)

- High-level modules depend on abstractions (interfaces)
- All dependencies injected via constructor
- No direct instantiation of concrete classes

### 9. Repository Pattern

- `ProcessPaymentRepository` with interface
- `ActivityLogRepository` with interface
- `IPNLogRepository` with interface
- All data access through repositories
- Easy to mock for testing
- Easy to swap implementations

## Architecture Overview

```
┌─────────────────────────────────────────────────────────────┐
│                      PayFast Facade                          │
└───────────────────────┬─────────────────────────────────────┘
                        │
                        ▼
┌─────────────────────────────────────────────────────────────┐
│                    PayFast (Main Class)                     │
│  - Orchestrates payment flow                                │
│  - Uses services via interfaces (DIP)                        │
└───────────────┬─────────────────────────────────────────────┘
                │
        ┌───────┴────────┬──────────────┬──────────────┐
        │                 │              │              │
        ▼                 ▼              ▼              ▼
┌──────────────┐  ┌──────────────┐  ┌──────────────┐  ┌──────────────┐
│Authentication│  │   Payment    │  │ Transaction  │  │     OTP     │
│   Service    │  │   Service    │  │   Service    │  │   Service    │
└──────┬───────┘  └──────┬───────┘  └──────┬───────┘  └──────┬───────┘
       │                 │                 │                 │
       └─────────────────┴─────────────────┴─────────────────┘
                        │
                        ▼
              ┌──────────────────┐
              │  HttpClient      │
              │  Service         │
              └──────────────────┘

        ┌─────────────────────────────────────┐
        │      Repository Pattern             │
        ├─────────────────────────────────────┤
        │  ProcessPaymentRepository          │
        │  ActivityLogRepository              │
        │  IPNLogRepository                   │
        └─────────────────────────────────────┘

        ┌─────────────────────────────────────┐
        │      Event System                   │
        ├─────────────────────────────────────┤
        │  PaymentInitiated                   │
        │  PaymentValidated                   │
        │  PaymentCompleted                   │
        │  PaymentFailed                      │
        └──────────────┬──────────────────────┘
                       │
        ┌──────────────┴──────────────┐
        │                             │
        ▼                             ▼
┌──────────────┐            ┌──────────────┐
│ Log Activity │            │ Send Emails  │
│  Listener    │            │  Listener    │
└──────────────┘            └──────────────┘

        ┌─────────────────────────────────────┐
        │      Email Notification             │
        ├─────────────────────────────────────┤
        │  EmailNotificationService           │
        │  - Customer notifications           │
        │  - Admin notifications              │
        │  - Publishable templates            │
        └─────────────────────────────────────┘
```

## File Structure

```
packages/zfhassaan/payfast/
├── src/
│   ├── Console/
│   │   ├── CABPayments.php              # Enhanced command
│   │   └── CABPayments.php.stub         # Publishable stub
│   ├── database/
│   │   ├── migrations/                  # All migrations
│   │   └── factories/                   # Model factories
│   ├── Events/                          # Payment events
│   ├── Listeners/
│   │   ├── LogPaymentActivity.php       # Audit logging
│   │   ├── SendPaymentEmailNotifications.php
│   │   └── StorePaymentRecord.php
│   ├── Models/
│   │   ├── ProcessPayment.php
│   │   ├── ActivityLog.php              # NEW
│   │   └── IPNLog.php                   # NEW
│   ├── Repositories/
│   │   ├── Contracts/                   # Interfaces
│   │   │   ├── ProcessPaymentRepositoryInterface.php
│   │   │   ├── ActivityLogRepositoryInterface.php  # NEW
│   │   │   └── IPNLogRepositoryInterface.php       # NEW
│   │   ├── ProcessPaymentRepository.php
│   │   ├── ActivityLogRepository.php    # NEW
│   │   └── IPNLogRepository.php         # NEW
│   ├── Services/
│   │   ├── Contracts/                   # Interfaces
│   │   │   └── EmailNotificationServiceInterface.php  # NEW
│   │   └── EmailNotificationService.php # NEW
│   ├── resources/
│   │   └── views/
│   │       └── emails/                  # Publishable templates
│   │           ├── status-notification.blade.php
│   │           ├── payment-completion.blade.php
│   │           ├── admin-notification.blade.php
│   │           └── payment-failure.blade.php
│   └── Provider/
│       └── PayFastServiceProvider.php   # Updated
├── tests/                               # NEW - Moved here
│   ├── Unit/
│   │   └── [All unit tests]
│   ├── Feature/
│   │   └── [All feature tests]
│   └── TestCase.php                     # Base test case
├── config/
│   └── config.php                       # Updated with email config
├── phpunit.xml                          # NEW
└── composer.json                        # Updated
```

## Configuration

### Environment Variables

Add to `.env`:

```env
# PayFast Configuration
PAYFAST_API_URL=
PAYFAST_SANDBOX_URL=
PAYFAST_MERCHANT_ID=
PAYFAST_SECURED_KEY=
PAYFAST_MODE=sandbox
PAYFAST_RETURN_URL=
PAYFAST_VERIFY_TRANSACTION=

# Email Notifications
PAYFAST_ADMIN_EMAILS=admin1@example.com,admin2@example.com
PAYFAST_EMAIL_SUBJECT_COMPLETION=Payment Completed Successfully
PAYFAST_EMAIL_SUBJECT_ADMIN=New Payment Completed
PAYFAST_EMAIL_SUBJECT_FAILURE=Payment Failed
```

## Publishing Resources

### Publish Config

```bash
php artisan vendor:publish --tag=payfast-config
```

### Publish Migrations

```bash
php artisan vendor:publish --tag=payfast-migrations
php artisan migrate
```

### Publish Email Templates

```bash
php artisan vendor:publish --tag=payfast-email-templates
```

Then customize in `resources/views/vendor/payfast/emails/`

### Publish Console Command

```bash
php artisan vendor:publish --tag=payfast-command
```

Then customize in `app/Console/Commands/PayfastCheckPendingPayments.php`

## Console Command Usage

```bash
# Check pending payments (default)
php artisan payfast:check-pending-payments

# Check specific status
php artisan payfast:check-pending-payments --status=otp_verified

# Limit results
php artisan payfast:check-pending-payments --limit=10

# Skip email notifications
php artisan payfast:check-pending-payments --no-email
```

## Email Templates Customization

After publishing templates, customize them in:
`resources/views/vendor/payfast/emails/`

All templates use Blade and can be styled to match your theme.

## Testing

```bash
# Run tests from package directory
cd packages/zfhassaan/payfast
composer install
./vendor/bin/phpunit

# Or from root
php artisan test --filter PayFast
```

## Architecture Principles Checklist

- **Single Responsibility**: Each class has one reason to change
- **Open/Closed**: Open for extension, closed for modification
- **Liskov Substitution**: Interfaces can be swapped
- **Interface Segregation**: Small, focused interfaces
- **Dependency Inversion**: Depend on abstractions, not concretions

## Repository Pattern Checklist

- All data access through repositories
- Repository interfaces for all entities
- Easy to mock for testing
- Easy to swap implementations
- Clean separation of concerns

## Audit & Transaction Logging

- All payment activities logged
- IPN records stored
- Transaction statuses tracked
- Metadata stored for analysis
- Soft deletes for data retention

## Email Notifications

- Customer notifications on status changes
- Admin notifications on payment completion
- Failure notifications
- Customizable templates
- Configurable subjects
- Multiple admin emails support

## Next Steps

1. Run migrations: `php artisan migrate`
2. Publish and customize email templates
3. Configure admin emails in `.env`
4. Test the console command
5. Customize console command if needed
