Post-Purchase UI Extension

Component catalog, lifecycle contract, and sandbox rules for @shopify/post-purchase-ui-extensions-react (post-purchase upsell surface, npm 0.13.5, package in maintenance — no newer version exists; the modern <s-*> checkout-extensions SDK has no post-purchase target as of writing).

⚠️ Check every prop against the types

Before you write a component prop, find it in the bundled .d.ts at node_modules/@shopify/post-purchase-ui-extensions-react/build/ts/index.d.ts. Memory invents plausible fake props (spacing="base", Button tone).

NEVER run the shopify skill's search_docs.mjs or validate.mjs for this SDK. Its docs don't cover @shopify/post-purchase-ui-extensions-react. Its polaris-checkout-extensions validator accepts only Polaris web components, so it rejects every post-purchase component (BlockStack, Button, …).

⚠️ Skip if a different surface

• Admin App Home <s-*> markup → use the shopify skill, topic polaris-app-home.
• Modern checkout extensions (@shopify/ui-extensions-react, <s-*> web components) → use the shopify skill, topic polaris-checkout-extensions.
• Customer account extensions → use the shopify skill, topic polaris-customer-account-extensions.

Doc lookup (WebFetch only)