Custom Invoicing App

A PHP & Stripe–powered client invoicing portal with dynamic receipt generation.

Custom Invoicing App Screenshot

Overview

This project is a **custom invoicing application** built with PHP on the backend and Stripe for payment processing. It allows authenticated clients to:

  • View outstanding invoices and payment history.
  • Generate new invoices with line‐items and taxes.
  • Checkout securely via Stripe’s API with dynamic receipt emails.
  • Download PDF copies of each invoice/receipt.

Role & Timeline

  • Role: Lead Developer (Architecture, API integration, UI)
  • Duration: February 2025 – April 2025
  • Team: Solo project (client & review process)

Tech Stack

PHP Stripe API MySQL Tailwind CSS JavaScript PDFLib

Challenges & Solutions

Dynamic PDF Generation
Utilized PDFLib to assemble invoices on-the-fly, ensuring layout fidelity across browsers and devices.
Secure Payment Flow
Integrated Stripe’s Checkout sessions with webhooks to validate payments before sending confirmation emails.
User Authentication
Built a simple token-based login and session management system, locking down all invoicing routes.

Results & Metrics

  • Reduced invoice creation time by 60% via dynamic templates.
  • Achieved 99.9% uptime during peak billing cycles.
  • Onboarded 20+ clients in the first month, processing over $50K in transactions.
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