According to the inquiry of A3 e-commerce seller's website, making up the difference generally refers to making up the postage difference. For example, the store sends small express by default. If you want the store to use mainstream express or SF Express, you need to make up the difference for the store. In addition, some customized or special charges can also be charged by making up the difference.
The price difference refers to the futures price difference of different grades, different delivery months, different commodities and different delivery locations. It also refers to the price difference of the same commodity due to various conditions, such as wholesale and retail price difference, regional price difference and seasonal price difference. The difference between buying and selling goods is the main part of some businessmen's profits.