How to Build a Production-Grade SaaS Billing System Using Stripe

A technical guide published on DEV Community outlines common pitfalls developers face when scaling Stripe-based billing beyond a few hundred customers. The article warns that processing Stripe webhooks synchronously within HTTP request handlers leads to duplicate events, out-of-order processing, and corrupted database states. To address this, the guide recommends an asynchronous architecture using a message queue — such as Redis, RabbitMQ, or AWS SQS — where a lightweight API receiver verifies webhook signatures and queues payloads for a separate worker to process. Because Stripe guarantees at-least-once delivery, the guide also demonstrates implementing idempotency checks using Redis keys with a 24-hour TTL to prevent duplicate billing actions. Usage-based billing is flagged as another high-risk area, with the naive end-of-month calculation approach cited as prone to race conditions and Stripe API rate-limit issues.