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Cart, inventory, discounts, checkout against Shopify Storefront API.
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| name | shopify-commerce |
| description | Cart, inventory, discounts, checkout against Shopify Storefront API. |
lib/shopify/storefront-client.ts (server-only).cart_id.add / update / remove) via POST /api/cart. Client uses useCart() (SWR).availableForSale + quantityAvailable; disable AddToCartButton.POST /api/cart/discount → cartDiscountCodesUpdate. Surface userErrors.cart.checkoutUrl. Attach buyerIdentity.customerAccessToken when logged in.next: { tags: ["product:<handle>"], revalidate: 60 }. Webhooks call revalidateTag.