A list of Country IDs, automatically generated from location_groups. Notes on Type: If Type is set, this will override the Account-Based Postage Calculate Type. item represents standard item based shipping, in which the price, price_addl, and method fields will be used to determine the cost to ship an item. carriers represent calculated shipping, in which the cost to ship an item will automatically be calculated based on carrier rates. Which carriers you enable, such as the USPS, UPS or FedEx can be updated from the Members Area > Selling > Seller Tools > Postage Setup page. Note that when setting type to carriers, price, price_addl, and method is optional, and if set, will be ignored. Additionally, please note that if you create a new listing which uses the type carriers, and you do not currently have any carriers enabled from the Postage Setup page, one will be enabled for you by default.