No matter import or export, it is necessary to cancel the letter of credit or other payment methods. After the export goods are declared and delivered, they will show their documents at the electronic port after receiving the payment, and then make the export verification form, customs declaration form, foreign exchange receipt memo, export invoice and verification form online to the foreign exchange bureau for verification, and then apply for tax refund. After the import goods have been negotiated by the customs declaration form and the bank, the documents will be presented at the electronic port, and then they will be directly written off at the foreign exchange bureau with the import verification form (Huanglian), customs declaration form and verification form, without online declaration. It should be noted that the mode of payment for import is letter of credit, and foreign exchange is paid in different places, and the advance payment needs to be written off. If you pay after the goods arrive, you don't have to go to the foreign exchange bureau. After the payment, the bank will make a verification declaration.