Checkout UI Extensions: Replace Script Tags With Polaris Targets
Checkout UI extensions (2026-07) add custom UI to cart review, payment, and thank-you — Plus-only on information, shipping, and payment steps.
Read article →App Integrations

New customer accounts are a separate surface from checkout and the theme. Add loyalty, B2B net-terms, or order-status widgets with Customer Account UI extensions.
Source: Customer Account UI extension target APIs (2026-07).
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Checkout UI extensions (2026-07) add custom UI to cart review, payment, and thank-you — Plus-only on information, shipping, and payment steps.
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