# Payment Integration System (US-Based)

**Tech Stack:** Angular · [ASP.NET](http://ASP.NET) Core Web API · MS SQL Server

### Overview

Worked on the **continuation and enhancement of an existing multi-channel payment integration system** for a US-based client. The platform enables secure digital payments across **banking and mobile money providers** in **Ghana and South Africa**, with added support for new payment features and improved transaction reliability.

### Key Contributions

* Took ownership of an **existing payment platform**, extending functionality without disrupting live transactions.
    
* Integrated and enhanced payment APIs for **Ecobank**, **MTN MoMo**, and **Vodacom M-Pesa**, aligning with provider-specific protocols and callback flows.
    
* Added **QR-based payment capabilities**, expanding supported payment initiation methods.
    
* Implemented **recurring billing and subscription logic**, including status tracking and failure handling.
    
* Enhanced **payment request workflows** for improved transaction initiation and monitoring.
    
* Extended **Angular front-end modules** for transaction creation, real-time status tracking, and history views.
    
* Improved [**ASP.NET**](http://ASP.NET) **Core Web APIs** for payment orchestration, validation, and secure processing.
    
* Strengthened **asynchronous callback handling and reconciliation** using MS SQL Server.
    
* Resolved production issues and optimized transaction flows to improve system stability.
    

### Impact & Results

* Successfully extended an existing payment system with **new payment channels and features**.
    
* Improved **transaction consistency, traceability, and reliability** in a live financial environment.
    
* Supported scalable payment operations across **multiple countries and providers**