Do you suspect that there is something wrong with the goods your friend sells? Then this is not easy to handle. If you two are on good terms, there should be no problem. If it works, don't worry. Perfume, to put it bluntly, is these. The bottle looks good, smells good and is fun to use. Some words, even tentative ones, will hurt feelings. Friends need trust.
But to put it mildly, if you are just friends and he is a WeChat business, then he may be completely lying to you.