If you woke up one day and found your carefully crafted Shopify login popup was broken, your custom account page was gone, or your clients were calling about a strange new login flow — you are not alone. In February 2026, Shopify officially deprecated legacy customer accounts. For new stores, the old system is no longer available. For existing stores that had not opted in, it is no longer receiving updates or technical support. We hit this at Ogresto while building a client store. The popup login we had built — seamlessly branded, smooth UX, no page redirect — broke overnight. Here is everything we learned. What Shopify Actually Changed The new system is called New Customer Accounts and it uses OAuth 2.0 with PKCE — the same authentication standard used by Google and Apple. It supports: Email OTP (one-time password) — no passwords needed Social login (Google, Facebook) Proper session management across storefront and checkout A hosted login and account page On paper it is better.…