Business AutomationWhatsApp APIFintechSME Solutions

PayDay

AI WhatsApp Invoice & Payment Bot

Production-ready MVP for sending invoices via WhatsApp and accepting payments through Stripe and M-Pesa with automated reminders.

live

•2024

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Value Proposition

Here's how this project creates value and solves real-world problems

🎯The Problem

Small and Medium Enterprises (SMEs) in emerging markets struggle with professional invoicing and payment collection. Traditional systems are expensive, complex, and don't integrate with local communication channels like WhatsApp that customers actually use.

💡The Solution

PayDay revolutionizes business billing by turning WhatsApp into a complete invoicing and payment platform. Send professional invoices via WhatsApp, accept payments through Stripe and M-Pesa, and automate follow-ups—all from one system.

🚀Value Created

For SMEs:90% reduction in payment collection time, professional invoicing without design skills, automated reminder system reducing manual work

For Customers:Familiar WhatsApp interface, local payment options (M-Pesa), instant payment confirmations, no app downloads required

For Businesses:Real-time payment tracking, multi-currency support, comprehensive analytics, seamless webhook integrations

📈Market Impact

Specifically designed for emerging markets where WhatsApp is the primary business communication tool. Features Docker deployment for scalability and robust webhook handling for enterprise reliability.

Project Impact

Payment Systems

2 integrated (Stripe + M-Pesa)

Automation

Fully automated invoicing flow

Target Market

SMEs in emerging markets

Architecture

Production-ready MVP

Key Features

WhatsApp-based invoice delivery
Stripe and M-Pesa payment processing
Automated payment reminders
Customer and invoice management
Real-time webhook handling
Multi-currency support
Admin dashboard with analytics
JWT-based authentication
Scheduled payment reminders
Docker containerization
Comprehensive API documentation
Database migrations with Alembic
Rate limiting and security
Mobile-responsive design

Technology Stack

FastAPIPythonReactVitePostgreSQLSQLAlchemyAlembicWhatsApp Business APIStripe APIM-Pesa Daraja APIDockerJWT AuthenticationAPSchedulerTanStack Query

Technical Challenges Solved

Integrating WhatsApp Business API with complex message formatting

Handling webhook synchronization between Stripe and M-Pesa

Building reliable payment reminder scheduling system

Ensuring message delivery reliability and error handling

Managing multi-currency transactions and conversions

Implementing robust error recovery for failed payments

Architecture

monolithic

FastAPI backend with React frontend, PostgreSQL database, and external API integrations. Dockerized deployment with scheduled tasks and webhook handling.

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