Be more specific what you are trying to do. Webhook on the botpress side would react to something done on Wechat, whereas Webhook on the Wechat side reacts to something done on Botpress. Which direction are you wanting to go? Also have you considered Zapier or Make.com?

Botpress don't have direct integration with WeChat cause it is a Chinese application. So does Zapier or Make.com. I am currently trying to send a post request to the botpress webhook but there is no return data. If I could get the return message, then it will be easier to do the rest.