Prior to the introduction of the split shipping feature, the Store API endpoints only supported a single shipping group. All items in the cart inherently belonged to that shipping group though the relationship between shipping group and cart items was not established in the order repository until the order was submitted. To that end, the pricing and order-related endpoints supported specification of the shipping address and shipping method for the default shipping group, via the shippingAddress and shippingMethod properties, in the request and response payloads. For backwards compatibility these properties continue to be supported in the request and response payloads with the caveats described below.

In request payloads, the shippingAddress and shippingMethod properties are:

In response payloads, the shippingAddress and shippingMethod properties refer to the shipping address and shipping method of the first shipping group in the shippingGroups array.