- Checkout UI extensions that support blocking now default to non‑blocking behavior (effective Jan 26 2026).
- Merchants must explicitly enable the “Allow app to block checkout” setting for blocking extensions; useExtensionEditor() should display a warning and update activation steps.
- Developers are encouraged to use Cart and Checkout Validation Functions for validation, as they are more secure, performant, and universally supported.
Checkout UI extensions now default to non-blocking behavior
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