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How to Build an Ecommerce App: Quick Overview
Building an ecommerce app connects product browsing with a cart and a purchase experience. A product can have choices such as size or colour, while a cart represents the items a person currently intends to buy. An order records a later stage of that interaction.
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Download on the App Store ↗A product choice changes what is being bought
A blue shirt in one size is a different selection from the same design in another size. The chosen option and quantity belong with the cart item, beyond the image shown in the product catalogue.
A cart is a changing intention
Adding an item to a cart does not mean a purchase is complete. Cart contents, checkout, and order status serve different roles, making an ecommerce idea a useful context for understanding records and changing state.
The cart and the completed order have different responsibilities
A cart collects a person's current choices. An order records what was accepted for purchase, including the relevant products and amounts. A later change to a product listing should not rewrite the meaning of an earlier order.
Stock, payment, and delivery also have their own states. A product appearing in a cart does not automatically mean payment succeeded or delivery began. This makes an ecommerce app a collection of connected workflows, rather than a product grid with a purchase button.
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