This call returns product (not kit) details. In addition to product information, the response also includes product quantities.
If specific codes/SKUs aren't requested (using "ProductCodes" or "ProductSkus" parameters), then all Alternate SKUs will always be returned as separate objects within the product array. The "IsAlternateSku" boolean will indicate whether the SKU is an Alternate (value of "true) or the primary or parent SKU (value of "false").
Currently, products will only return under their Primary Code unless Alternate Codes are specified in the "ProductCodes" parameter.