Stripe, subscriptions, invoicing, and merchant setup that reconciles to the cent.
Your checkout works but nothing downstream does. Failed payments vanish silently, proration is guesswork, and no one can answer what MRR actually is.
Scoped precisely before we quote. Anything not on the agreed list gets requoted openly rather than billed quietly.
Describe the problem in a few sentences. We'll tell you honestly whether it's something we should take on, then quote it properly once we've seen it.