# Payment Portal & SMTP Mailing System - Implementation Notes

This document provides a comprehensive report of the audit, redesign, construction, and security verification of the **Flutterwave Payment Gateway** and **SMTP Mailing System** for Kevron Suites and Apartments.

---

## 1. Pre-Development Audit Findings & Resolves

### Existing Payment Gateway (Paystack vs Flutterwave)
- **Status:** Paystack was originally set up as the primary payment gateway.
- **Action:** Paystack has been completely disabled and removed from all customer-facing interfaces, buttons, checkout selections, settings, and migrations.
- **Flutterwave:** Flutterwave Standard Checkout is now the sole active online gateway. All secrets and API credentials are loaded dynamically from `.env` and configured via `config/flutterwave.php`.

### SMTP Outgoing Mail Config Issue
- **Audit Discovery:** The `config/mail.php` configuration file lacked the `'encryption'` key within its `smtp` array. As a result, Laravel ignored the `MAIL_ENCRYPTION=ssl` setting from `.env` and attempted unencrypted connections, leading to handshake errors on secure port 465.
- **Resolution:** Added `'encryption' => env('MAIL_ENCRYPTION', 'tls'),` inside the `smtp` block in `config/mail.php`. Secure SSL mailing now operates flawlessly.

---

## 2. Architecture & Implementation

### A. Database Schema Changes
The database was updated via migration `2026_06_03_080000_create_payment_and_mail_systems_tables.php`, adding:
1. **Payments Table Enhancements:** Added `gateway`, `tx_ref`, `payment_channel`, `flutterwave_transaction_id`, `flutterwave_flw_ref`, `flutterwave_payment_type`, `paid_at`, `verified_at`, `failed_at`, `failure_reason`, and `metadata`.
2. **Payment webhook events Table Enhancements:** Added `tx_ref`, `flutterwave_transaction_id`, `payload_redacted`, `signature_valid`, `processed_at`, and `processing_error`.
3. **New Tables Created:**
   - `payment_transactions` — Raw logs of payment events.
   - `payment_status_histories` — History log tracking how payment statuses transition.
   - `payment_attempts` — Logs of initialization attempts including IP and User Agent.
   - `email_templates` — Dynamic database-driven email templates.
   - `email_logs` — Outgoing emails, delivery status, and errors.
   - `email_recipients` — Direct, CC, and BCC recipient addresses.
   - `email_attachments` — Logged attachments for outgoing emails.
   - `mail_settings` — Custom mail settings catalog.

### B. Core Classes & Services
- **`app/Services/Payments/FlutterwaveService.php`:** Initiates checkout, processes transaction verifications by ID/Ref, and redacts sensitive card/customer fields for secure logging.
- **`app/Services/PaymentService.php`:** Initiates payment flows, handles private file uploads for bank transfer proofs, and updates status database transaction locking (`lockForUpdate()`) to ensure idempotency.
- **`app/Http/Controllers/Payments/FlutterwavePaymentController.php`:** Controller endpoints for checkout redirect, callbacks, timing-safe webhooks, status checks, success/failure views, and payment retries.
- **`app/Mail/KevronMail.php`:** Unified mailable loading dynamic layouts from database/fallbacks, parsing placeholder variables, linking attachments, and logging transmission successes or failures.

### C. Filament Admin Dashboard Extensions
The following resource managers were added:
1. **`PaymentWebhookEventResource`:** View incoming webhook payloads. Features a **Reprocess** action to trigger transaction verification and idempotent booking confirmation.
2. **`PaymentStatusHistoryResource`:** Read-only log mapping state transitions.
3. **`PaymentAttemptResource`:** Tracks customer initialization requests.
4. **`EmailTemplateResource`:** Admin interface to manage subjects, bodies, and view available variables.
5. **`EmailLogResource`:** View outgoing mail logs. Features a **Resend** action that immediately redispatches the exact email body and logs the action.
6. **`PaymentResource` Updates:** Added a **Verify Payment** action (queries Flutterwave API server-side using the `tx_ref`) and a **Resend Emails** action to re-dispatch the confirmation email.
7. **`SmtpSettingsPage` (Custom Page):** Secure configuration dashboard. Displays SMTP values with masked password fields and features a Livewire **SMTP Test Mailer** form.

---

## 3. Security Implementation Highlights
- **Environment Isolation:** No secret keys or credentials (such as Flutterwave private keys or SMTP passwords) are hardcoded.
- **Timing-Safe Webhook Check:** Webhook requests validate the `verif-hash` header using PHP's timing-safe `hash_equals()` against the configured secret.
- **Webhook Redaction:** Card info and phone/email variables are automatically masked in log records to prevent personal data leaks.
- **Idempotency:** DB row locking (`lockForUpdate()`) protects against duplicate confirmation threads between concurrent webhook and callback redirects.

---

## 4. Test Results

Automated feature test suites have been implemented and validated:

### 1. Flutterwave Payments (`tests/Feature/FlutterwavePaymentTest.php`)
- `test_payment_initialization_creates_payment_record_and_redirects` — **PASSED**
- `test_callback_route_verifies_transaction_and_completes_booking` — **PASSED**
- `test_webhook_signature_timing_safe_validation` — **PASSED**

### 2. SMTP Mailer (`tests/Feature/SmtpMailTest.php`)
- `test_smtp_configuration_reads_correctly` — **PASSED**
- `test_booking_confirmation_email_renders_variables` — **PASSED**
- `test_emails_are_queued_and_logged` — **PASSED**

---

## 5. Deployment Instructions

1. Ensure the following environment variables are configured in `.env` in production:
   ```env
   MAIL_MAILER=smtp
   MAIL_HOST=kevronapartments.com
   MAIL_PORT=465
   MAIL_USERNAME=info@kevronapartments.com
   MAIL_PASSWORD=YOUR_PRODUCTION_SMTP_PASSWORD
   MAIL_ENCRYPTION=ssl
   MAIL_FROM_ADDRESS=info@kevronapartments.com
   MAIL_FROM_NAME="Kevron Suites & Apartments"

   FLUTTERWAVE_ENV=live
   FLUTTERWAVE_ENABLED=true
   FLUTTERWAVE_PUBLIC_KEY=FLWPUBK-...
   FLUTTERWAVE_SECRET_KEY=FLWSECK-...
   FLUTTERWAVE_WEBHOOK_SECRET=YOUR_FLUTTERWAVE_WEBHOOK_HASH_SECRET
   FLUTTERWAVE_ENCRYPTION_KEY=FLWENCK-...
   ```
2. Run database migrations:
   ```bash
   php artisan migrate
   ```
3. Run database seeders to register default templates:
   ```bash
   php artisan db:seed --class=EmailTemplateSeeder
   ```
4. Start the background queue worker to process email jobs:
   ```bash
   php artisan queue:work
   ```