How do we handle subscription billing logic?
Billing looks simple until real customers arrive. We build on Stripe Billing and write the surrounding logic carefully: plan changes and proration, trials, coupons, tax settings, failed payments and retries, cancellations and refunds.
Webhooks are processed so that a repeated or out-of-order event does not charge or credit anyone twice. We test these paths with Stripe's test mode and written scenarios before launch, and we document who owns each edge case so support is not guessing later.
