A complete, self-hosted invoice and billing system for freelancers, consultants, small businesses, and agencies. Built with plain PHP and MySQL — no frameworks, no Composer, no monthly subscriptions.

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✅ CORE FEATURES

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AUTHENTICATION

• Register, login, logout with bcrypt hashing

• Session hardening (HttpOnly, SameSite, ID regeneration)

• CSRF protection on every form

CLIENT MANAGEMENT

• Full CRUD (create, read, update, delete)

• Search by name, email, company

• Filter by status (active / archived)

• Archive instead of delete (preserves history)

• Delete protection if invoices exist

INVOICING

• Create invoices with dynamic line items

• Auto-calculation of subtotal, tax, discount, total

• Multi-currency support (PKR, USD, EUR, GBP, AED, SAR)

• Invoice numbering with custom prefix

• Status workflow (draft → sent → partial → paid / overdue / cancelled)

• Edit draft and sent invoices

• Duplicate invoice

• Mark as sent / paid / cancelled

• Auto-overdue detection

PAYMENTS

• Record partial and full payments

• 6 payment methods (EasyPaisa, JazzCash, Bank, USDT, Cash, Other)

• Payment reference and notes

• Auto-update invoice amount_paid and status

• Payment list with search and filter

• Delete payment reverses invoice state

PDF EXPORT

• Professional A4 layout via Dompdf

• Company logo in PDF header

• Clean table-based layout

• Multi-page support

• Preview and download modes

PRINT VIEW

• Dedicated print CSS

• Only invoice paper prints (no sidebar/header/footer)

• A4 page setup

REPORTS & ANALYTICS

• Total billed / paid / outstanding / overdue

• Revenue bar chart (last 12 months)

• Invoice status doughnut chart

• Top clients by revenue

• Outstanding aging report (5 buckets)

• Recent activity feed

COMPANY SETTINGS

• Company name, email, phone, address, tax ID

• Logo upload (JPG, PNG, WEBP)

• Default currency, tax rate, invoice prefix

• Payment terms and notes

• Auto-applied to new invoices

ADMIN PANEL

• Site-wide statistics

• User management (search, filter, suspend, role change)

• All invoices view

• Top users by revenue

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💻 TECH STACK

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• PHP 8.0+

• MySQL 5.7+ / MariaDB

• PDO (no ORM)

• Tailwind CSS (CDN)

• Vanilla JavaScript

• Chart.js (analytics charts)

• Dompdf (PDF export)

• Font Awesome icons

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🔒 SECURITY

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• PDO prepared statements everywhere

• CSRF tokens on every POST form

• XSS escaping on all output

• Bcrypt password hashing

• Session hardening

• Real MIME validation on uploads

• Non-enumerable login errors

• Admin self-protection

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📦 WHAT YOU GET

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• Full source code (~40 files, organized)

• Complete database schema with foreign keys

• Demo data (admin user + sample client)

• Full documentation (README.md)

• Commercial license (LICENSE.txt)

• Changelog (CHANGELOG.md)

• 12 product screenshots

• Free updates for 12 months

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🎯 WHO THIS IS FOR

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• Freelancers who bill clients regularly

• Small businesses and shops

• Consultants and agencies

• Developers needing a billing foundation

• Anyone tired of paying monthly SaaS fees

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⚙️ INSTALLATION (10 MINUTES)

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1. Upload files to your host

2. Import database/schema.sql via phpMyAdmin

3. Update credentials in config/config.php

4. Download and extract Dompdf to libs/dompdf/

5. Generate password hashes with included tool

6. Log in and start invoicing

Full step-by-step guide in README.md.

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💡 REQUIREMENTS

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• PHP 8.0+ (with pdo_mysql, mbstring, fileinfo, gd extensions)

• MySQL 5.7+ / MariaDB

• Apache (with .htaccess) or Nginx

• ~15 MB disk space

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📞 SUPPORT

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🌐 Website: https://skillvexa.netlify.app

🌐 Website: https://skillvexacv.netlify.app

🌐 Website: https://shop-skillvexa.netlify.app

💬 WhatsApp: https://wa.me/923297719039

👥 Community: https://chat.whatsapp.com/IS5W84y0GZQ8jGYFJryiPe

📘 Facebook: https://www.facebook.com/share/1ExPVhCuGr/

🎵 TikTok: https://www.tiktok.com/@skill.vexa

▶️ YouTube: https://www.youtube.com/@SkillVexa-n9v

📧 Email: [email protected]

Response time: usually under 24 hours.

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📌 LICENSE

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Personal + Commercial use allowed.

Use on unlimited personal and client projects.

You may NOT resell or redistribute the source code itself.

Full terms in LICENSE.txt.

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Ready to ship faster? Download now.

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