Wechat Payment is an innovative mobile payment product jointly launched by Wechat and Tenpay. Nowadays, with the full opening of WeChat payment, there are more and more related demands. Many developers are faced with many doubts when developing WeChat payment and merchants applying for WeChat payment. This paper will introduce the key technologies of WeChat payment from the aspects of payment application to the use of main interfaces, combining with the practice of WeChat payment interface development. URL Settings At present, WeChat payment can only be applied through micro-authentication service number, and subscription number and unauthenticated service number cannot be applied. Log in to the background of WeChat public platform, and you can find "WeChat Payment" in the left column. Click to enter the application interface, and you can see the "basic information of merchants" in the first item. Click the "Fill in" button on the right to enter the WeChat payment setting interface. There is no fixed setting method for the directory and website of WeChat payment, which needs to be determined according to your own needs. Table 1 is the plan of Fangbei Studio.