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Product Advertising API
Developer Guide (API Version 2013-08-01)

Create a Shopping Cart

When a customer adds an item to the cart, the cart detail page appears. This is the same action as the CartModify operation. The following example shows how you can modify items in the cart.

CartModify operation with the parameter Quantity=0
CartModify operation with the parameter Action=SaveForLater
CartModify operation with the parameter Quantity=1
PurchaseURL element