1. Only officially released mini programs can use the unlimited mini program code generation interface, so if your mini program has not been officially released and launched, you cannot display the mini program QR code;
2. The mini program is online, but the page path when generating the mini program QR code is a new page (the online version does not have this page path), and the mini program code cannot be obtained. In other words, you can only obtain the mini program code for the page path that exists in the online official version;
3. When synthesizing product posters, you need to download the mini program code before displaying it. If there is no abnormality in the above two steps, it is likely that the correct Download domain name is not set in the legal domain name of your mini program. Please go to settings:
["Set a legal server domain name"](https://www.yuque.com/apifm/doc/tvpou9)