Santanu : The Synthesio integration is no longer available. It has been removed from Pega Exchange...but apparently the documentation is still on the Pega Community. (I'll look to get that removed right away.)
@gattuba1 : I hope this didn't cause any confusion. Regarding WeChat, we are looking to support additional messaging channels starting in the Pega Customer Service 8.3 release (target GA: mid-2019). I don't know if WeChat would be one of those initial channels, or added in a successive release, but there has certainly been other interest in WeChat.
I'm curious about your use case. Are you looking to integrate WeChat with Pega Customer Service, or via a separate application? And would it be for reviewing and responding to WeChat conversations, analyzing those conversations in bulk, or other things?