InvoiceFlow – PHP Invoicing & Billing System with Stripe, PDF & Customer Management

demonstration video:

https://drive.google.com/file/d/1navo1yT-m4ATNm2sk8Qusx0-pV0wXNeH/view?usp=sharing

InvoiceFlow is a professional PHP invoicing and billing system designed to help developers, freelancers, agencies and small businesses build their own online billing platform without starting from scratch.

Instead of spending weeks developing invoice logic, customer management, payment handling and PDF generation, you get a structured PHP application with the essential building blocks already organized and ready for customization.

💼 Complete Invoicing Workflow

Create and manage invoices, keep customer information organized and calculate invoice totals through dedicated application components.

The project includes separate controllers, models, services and helpers, making the codebase easier to understand, modify and extend.

💳 Stripe Payment Integration

InvoiceFlow includes a dedicated Stripe service and a Stripe webhook endpoint, giving you a solid foundation for integrating online invoice payments into your application.

You can adapt the payment flow to your own business model, pricing structure or client portal.

📄 Professional PDF Invoices

Generate invoice documents through the included PDF service and dedicated invoice PDF view.

This makes InvoiceFlow suitable for applications where invoices need to be generated, downloaded, stored or integrated into a larger billing workflow.

👥 Customer Management

The application includes dedicated customer and invoice models/controllers, giving you a clean foundation for managing customers and connecting them with billing records.

⚙️ Developer-Friendly Architecture

InvoiceFlow is organized using a clear application structure:

• Controllers

• Models

• Services

• Helpers

• Views

• Database layer

• Router

• Configuration

• Public entry point

This separation makes the project easier to customize and provides a strong starting point for building a larger billing, invoicing or SaaS application.

🚀 Built to Extend

InvoiceFlow can be adapted for many use cases, including:

• Freelancer invoicing systems

• Agency billing platforms

• Client management portals

• Small business billing tools

• Internal invoicing applications

• Subscription or SaaS projects

• Custom payment platforms

The source code gives developers a practical foundation that can be extended with features such as user accounts, recurring billing, subscriptions, reports, notifications, multi-company support or additional payment providers.

You are not buying a closed service — you are getting the PHP source code to customize for your own project.

📦 What You Get

InvoiceFlow includes the application source, database structure, installation entry point, frontend JavaScript, Stripe webhook endpoint, PDF generation components and configuration files.

Whether you want to launch your own invoicing application or use the code as a foundation for a larger business platform, InvoiceFlow helps you start with the core billing infrastructure already in place.