EUB: It is a parcel service launched by Postal EMS. The packaging requirements for goods are the same as those for parcels, and it only arrives in specific countries. Sellers on the eBay platform can directly enter the Postal EUB system to apply for a tracking number, download and print address labels and customs declarations, which is called online delivery; orders on other platforms such as Amazon require a specific logistics system (such as Xiapu Logistics' ishipper logistics management system) to apply for a tracking number and print orders, which is called offline delivery.