Payment Lifecycle Integration Backend
crystal zhu
Payment Lifecycle Integration Backend
Overview
This project demonstrates how to design a reliable internal payment lifecycle around an immutable external payment provider.
Instead of treating provider-side status as the workflow itself, the system keeps internal lifecycle ownership on the backend and updates state through controlled transitions.
What it demonstrates
Internal payment lifecycle modeling
Explicit state transitions
Idempotent payment creation
Webhook-driven state updates
Audit-friendly status tracking
Why it matters
In real systems, external payment providers are asynchronous and outside internal control.This project focuses on the backend challenge of keeping internal workflow correct, traceable, and safe to evolve.
Tech stack
Java
Spring Boot
PostgreSQL
REST
Stripe HTTP API
Manual reconciliation for recovery
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Posted Mar 13, 2026
A backend project focused on payment lifecycle control, idempotency, webhook-driven updates, audit logs, and reconciliation around an external payment provider.
