At Xerocon London 2026, Regan Ashworth, Head of Ecosystem Governance at Xero, built a working, Xero-connected e-commerce app live on stage in 15 minutes. No code, one ready-made prompt, and a real invoice sitting in a real Xero organisation at the end to prove it. The build was deliberately simple: a one-product online store (a beltless trench coat, for the Seinfeld fans) that creates a contact and an invoice in Xero after every sale, then opens the online invoice for the customer to pay.