The situation
The platform integrated payment providers one by one, each with its own quirks. Adding a new provider took weeks, failures were hard to trace, and there was no unified view of payment reliability.
What we did
We designed and built a single payment gateway API that abstracts five providers behind one interface, with a normalized data model in PostgreSQL, Redis for fast state, and idempotent, retry-safe flows. Everything is containerized with Docker for consistent deployment.
The outcome
The gateway holds 99.99% payment uptime, a new provider can be connected in 2 days instead of weeks, and payment failures dropped by 30%.