Panel/Website/PAYMENT_IMPLEMENTATION_SUMMARY.md

Payment System Implementation Summary

Date: November 5, 2025
Status: ✅ COMPLETED - Ready for Testing

What Was Done

1. Updated Copilot Instructions ✅

• Added explicit standalone/relocatable requirements for modules/billing/
• Emphasized: NEVER include panel files, use only standard PHP mysqli
• Documented that billing module can be deployed on separate web host
• All URLs must be root-relative (no /modules/billing/ in runtime paths)

2. Documented Status Values ✅

Invoice Status (ogp_billing_invoices.status):

• due - Unpaid invoice, awaiting payment
• paid - Invoice paid, order created
• pending - Legacy status (some admin pages use this)
• renew - Renewal invoice

Order Status (ogp_billing_orders.status):

• paid - Payment received, awaiting server provisioning (panel auto-creates and marks active)
• active - Server provisioned and running
• suspended - Payment overdue, server stopped (grace period)
• deleted - Server permanently removed
• renew - Active but needs renewal payment

3. Rebuilt Cart System ✅

File: modules/billing/cart.php

Features:

• Displays all unpaid invoices (status='due') for logged-in user
• Shows: Game type, server name, duration, quantity, price
• Professional table layout with totals
• PayPal JS SDK integration (client-side payment)
• Calls /api/capture_order.php backend after PayPal approval
• Handles empty cart gracefully
• Uses only standard mysqli (standalone compatible)

Payment Flow:

1. User clicks PayPal button
2. PayPal JS SDK creates order and processes payment
3. On approval, calls our /api/capture_order.php with order_id
4. Backend marks invoices paid, creates orders
5. Redirects to /payment_success.php

4. Rewrote Payment Capture Backend ✅

File: modules/billing/api/capture_order.php (old version backed up as .backup)

Features:

• Simplified from 461 lines to ~250 lines
• Clean output buffering (prevents JSON corruption)
• Comprehensive logging to logs/payment_capture.log
• Verifies PayPal order capture
• Marks all due invoices as paid
• Creates billing_orders records with status='paid'
• Stores full PayPal response JSON in paypal_data column
• Returns minimal JSON response (no truncation issues)

Security:

• No output before JSON response
• Validates session user_id
• Logs all steps for debugging/audit trail
• Stores PayPal transaction ID for refunds

5. Enhanced Success Page ✅

File: modules/billing/payment_success.php

Features:

• Professional confirmation page with success icon
• Shows recent orders with details
• Explains next steps (panel auto-provisioning)
• Links to account management and order pages
• Uses only standard mysqli (standalone compatible)

Database Schema

Required Tables (Already Exist)

• ✅ ogp_billing_invoices - Stores invoices (due/paid)
• ✅ ogp_billing_orders - Stores orders (paid/active/suspended/deleted)
• ✅ ogp_billing_services - Game server packages/pricing
• ✅ ogp_billing_coupons - Discount coupons

New Column Required

Run this SQL:

ALTER TABLE `ogp_billing_orders` 
ADD COLUMN `paypal_data` TEXT NULL AFTER `payment_txid`
COMMENT 'Full PayPal API response JSON for tracking/refunds';

File: modules/billing/add_paypal_data_column.sql

Payment Flow Diagram

User → order.php (select server)
  ↓
add_to_cart.php (create invoice with status='due')
  ↓
cart.php (show unpaid invoices + PayPal button)
  ↓
PayPal Checkout (user pays)
  ↓
api/capture_order.php (backend processing):
  - Verify PayPal payment
  - Mark invoices status='paid'
  - Create orders with status='paid'
  - Store PayPal JSON data
  ↓
payment_success.php (confirmation)
  ↓
User logs into Panel
  ↓
Panel auto-provisions servers (paid → active)

Configuration

PayPal Credentials

Location: modules/billing/api/capture_order.php (lines 44-45)

$sandbox = true; // Set to false for live
$client_id = 'YOUR_CLIENT_ID';
$client_secret = 'YOUR_CLIENT_SECRET';

Also update in: modules/billing/cart.php (line 47)

Database Connection

Location: modules/billing/includes/config.inc.php

$db_host = "your_host";
$db_user = "your_user";
$db_pass = "your_password";
$db_name = "panel";
$table_prefix = "ogp_";

Testing Checklist

Pre-Test Setup

• Run SQL: add_paypal_data_column.sql
• Verify PayPal sandbox credentials are set
• Confirm database connection works
• Ensure user is logged in (session has website_user_id)

Test Flow

1. Order Creation

   • Go to /order.php
   • Select a game server
   • Configure settings
   • Click "Add to Cart"
   • Verify invoice created in ogp_billing_invoices with status='due'

2. Cart Display

   • Go to /cart.php
   • Verify invoice(s) displayed with correct details
   • Verify total amount is correct
   • Verify PayPal button appears

3. Payment Processing

   • Click PayPal button
   • Complete sandbox payment
   • Check logs/payment_capture.log for processing details
   • Verify no JSON errors in browser console
   • Verify redirected to /payment_success.php

4. Database Verification

   • Check ogp_billing_invoices: status='paid', payment_txid set
   • Check ogp_billing_orders: New record with status='paid'
   • Check paypal_data column contains JSON
   • Verify order_id in invoice links to order

5. Success Page

   • Verify order(s) displayed
   • Verify correct amounts shown
   • Verify all links work

6. Panel Provisioning (Future - Not Implemented Yet)

   • Log into panel
   • Panel detects orders with status='paid'
   • Panel creates game server homes
   • Panel updates order status='active'

What's NOT Done Yet (Todo)

High Priority

• Email Notifications - Send confirmation email after payment
• Invoice History Page - Show user's paid invoices (my_invoices.php)
• Suspended Status Support - Verify cron job handles suspended orders correctly

Medium Priority

• Refund System - Admin interface to issue PayPal refunds using stored JSON data
• Webhook Support - Add PayPal webhook handler for payment verification (more secure than client-side)
• Coupon Application - Apply discount coupons during checkout

Low Priority

• Multi-currency Support - Currently USD only
• Tax Calculation - Add tax/VAT support
• Payment Plans - Recurring subscriptions via PayPal

Files Modified

Core Payment Files

• ✅ modules/billing/cart.php - Complete rewrite
• ✅ modules/billing/api/capture_order.php - Simplified rewrite (old backed up)
• ✅ modules/billing/payment_success.php - Enhanced with order display

Configuration

• ✅ .github/copilot-instructions.md - Added standalone/relocatable requirements

Database

• ✅ modules/billing/add_paypal_data_column.sql - New migration file

Existing Files (Not Modified)

• modules/billing/add_to_cart.php - Already working correctly
• modules/billing/order.php - Already working correctly
• modules/billing/includes/config.inc.php - Config file (no changes needed)

Troubleshooting

Issue: JSON Parse Error

Cause: Output before JSON response (whitespace, errors, warnings)
Fix: Check logs/payment_capture.log for errors. Ensure ob_start() at top of capture_order.php

Issue: No Orders Created

Cause: User not logged in or session lost
Fix: Verify session contains website_user_id or user_id

Issue: Invoices Not Marked Paid

Cause: Database connection failed or SQL error
Fix: Check logs/payment_capture.log for database errors

Issue: PayPal Button Doesn't Appear

Cause: Empty cart or JS error
Fix: Check browser console. Verify invoices exist with status='due'

Issue: 500 Error on capture_order.php

Cause: PHP error in capture script
Fix: Check logs/payment_capture.log and PHP error logs

Deployment Notes

Same Host Deployment

Files already at correct location: modules/billing/

External Host Deployment

1. Copy entire modules/billing/ directory to external web host
2. Deploy at website root (not in subdirectory)
3. Update includes/config.inc.php with panel database credentials
4. Ensure external host can connect to panel database (firewall/network)
5. Update PayPal return URLs to external domain

Security Considerations

✅ Implemented:

• Output buffering prevents JSON corruption
• SQL injection protection (mysqli_real_escape_string)
• Session validation (user_id required)
• PayPal OAuth token authentication
• Comprehensive audit logging

⚠️ Recommended (Not Implemented):

• CSRF token validation on payment endpoints
• Rate limiting on API endpoints
• PayPal webhook signature verification
• IP whitelisting for admin functions

Support & Maintenance

Log Files

• modules/billing/logs/payment_capture.log - Payment processing log
• modules/billing/logs/add_to_cart.log - Cart/invoice creation log
• modules/billing/logs/site.log - General site log

Key Functions

• capture_order.php::log_payment() - Payment logging function
• Database schema in create_invoices_table.sql

Contact

For issues or questions, refer to:

• GitHub repo: GameServerPanel/GSP branch Panel-unstable
• This summary: modules/billing/PAYMENT_IMPLEMENTATION_SUMMARY.md