Architecting Multi-Tenant SaaS Billing with Stripe

Introduction to Multi-Tenant Billing

Billing is the engine of any SaaS application. When building a multi-tenant SaaS platform, designing a flexible billing system that scales alongside customer growth is a critical design requirement. Using Stripe, we can build custom subscription rules, seat-based billing tiers, and usage-based models.

Core Architectural Flow

A resilient multi-tenant billing system requires three main layers:

• Database Sync: Local tables storing tenant subscription states, subscription item quantities, and stripe customer IDs.
• Stripe Checkouts: Passing user tokens and tenant details in metadata to Stripe checkout sessions to dynamically initialize accounts.
• Webhook Handlers: Robust handlers that verify signatures, capture event data, and update tenant states asynchronously.

Webhook Handling & Retries

Network interruptions happen. Webhooks from Stripe must be processed as idempotent tasks. We recommend using a job queue (e.g. BullMQ on Redis) to parse events. If database writes fail, the worker automatically retries, preventing client lockouts.

Database Schema Example

A clean SQL schema mapping tenant states typically stores: customer ID, current period end, active status, plan type, and token credentials. By checking these fields in middleware, you can block expired workspace access instantly.