Do a good job of contract registration and withdrawal registration of advance payment on the online service platform of the State Administration of Foreign Exchange. Contract registration refers to the purchase and sale contract you signed with foreign businessmen, so the amount is 50 thousand dollars. If you have received the advance payment, you will make a withdrawal registration. If the goods have been exported, take the corresponding customs declaration form to the system to cancel the registration of advance payment. Remember, the cancellation amount is the amount of advance payment, which means $8,482, not $8,500.