Service import and export belongs to intangible trade. This import and export includes proprietary production technology, commercial services, after-sales service, trademark license or transfer, patent technology license or transfer, etc. These intangible trades are collectively referred to as non-trade payment of foreign exchange. There are many examination and approval departments, such as the Municipal Commercial Committee and the Municipal Administration for Industry and Commerce, which are generally filed or approved by provincial and municipal government departments. Depending on the specific project, contract approval is generally the main method. After these departments get the corresponding registration certificates, they will go to the tax bureau to pay taxes. Just take the registration certificate and tax payment certificate to the bank to purchase foreign exchange.