Shopify shut off the legacy Thank you and Order status pages, checkout ScriptTags, and the Additional scripts box on Aug 26, 2026 for non-Plus stores. If you did not migrate, what you had there is already not running: pixels, upsells, surveys, custom scripts. Nothing errors, so nothing tells you. CheckoutProof scores your store 0-100, names the legacy scripts it can see, and maps each to its approved replacement: Web Pixels, Checkout UI Extensions, or native integrations. Zero customer data.