If you mentioned your official WeChat account, you can do this by setting up your developer's server. When a regular user sends a message to the official account, the wechat server sends the XML package to your predefined URL, and you can store the data in your database for further analysis. For more information, kindly consider this URL: http://admin.wechat.com/wiki/index.php?title=Common_Messages
If you mentioned a normal user account, since I know that it is not possible to load / commit an incoming message from the web API.
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