This project was born from the need to unify payment processing for a suite of independent applications (SaaS, E-commerce, Gaming) into a single, robust infrastructure. The core architectural metaphor was the 'Mall' (The Gateway) and 'Stores' (Client Apps).

The challenge wasn't just processing payments, but orchestrating complex financial flows securely and reliably across a distributed system. I engineered a Hybrid Frontend-First architecture where the backend never touches raw card data, relying on secure tokenization to ensure PCI compliance.

The system features a sophisticated 'Self-Healing' webhook mechanism to handle distributed race conditions, ensuring zero data loss even when provider notifications arrive out of order. Built with a strict adherence to SOLID principles and Clean Architecture, the platform leverages Prisma ORM for type-safe database interactions and implements a custom Native Subscription Engine that bypasses provider limitations to offer full control over recurring revenue cycles.