Checkout
Checkout is hosted by Shopify. A theme does not render it: the storefront's job ends at the handoff, when a cart or a buy-now path posts to the checkout URL. Everything a theme can influence sits before that boundary — what is in the cart, which line-item properties travel with it, and which control starts the transition.
How We've Used It
Our work stops at the boundary, and that is the point. One gated build touches this surface: a per-product buy-now path that clears the cart, adds a single item and hands the shopper straight to checkout. The pattern behind it holds everywhere else. Anything that has to survive the handoff is written as cart or line-item data, because a line-item property reaches the order and a theme-side variable does not. Anything else — messaging, incentives, bundle logic — is finished before the shopper leaves, since the theme has no say once they do.
Builds Using It
No page in this batch covers a build on it yet. One gated build uses it; its page follows.