Launched a self-serve plan switcher for our Stripe customers

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Customers change plans without emailing support.

Upgrades, downgrades, and the proration explained in plain words before you confirm. Support was handling about fifteen of these a week by hand, and each one was a chance to get the billing wrong.

Lovable built the interface and I wrote the Stripe side myself, because proration is not something I wanted generated. The surprise was downgrades: customers expected a refund, Stripe gives credit, and no amount of good code fixes that. The explanation screen did.