Google recently launched a feature that allows merchants to create a shopping cart widget that sits on top of a browser so customers can purchase more than one item at a time. The company said the shopping cart now supports the product-shipping and product-shipping-first keywords for basic per item shipping calculation. Merchants can also specify carrier calculated shipping and custom flat shipping rates using the Checkout HTML API.
Google Checkout documentation used an example in which a camping store could set up rules, such as "sleeping bags have a shipping cost of $5 and tents have a shipping cost of $7." If a customer orders two sleeping bags and one tent, the total shipping would be $17. Merchants can also specify shipping rules such as, "$5 for the first item and $2 for each additional item."
More information is available on the Google Checkout Developers Forum.
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