One payment flow for five completely different services

A client booking a mixing session and a client buying a software landing page go through the exact same four-step checkout. Same Stripe Elements form, same confirmation screen, same automatic consultation booking via Google Calendar. The only difference is the data — the product name, the price, the description. Everything else is shared. That was the whole point of the component architecture. The checkout wizard, the sidebar accordion, the product cards, the booking flow — they are all service-agnostic. Adding a new package to any service means adding one object to a TypeScript array. No new components, no new API routes, no new payment logic. The git log shows dozens of commits building this system. What it does not show is how little effort it takes to extend it now that the foundation is in place.