1- buyer seller to chat(would be responsive)
2- chat contents: user online/offline status, attach files, archive messages, last received /sent time, last seen, message seen unseen.
3- website and email notification to buyer and seller on new message, also show red notification icon and new messages on top menu like freelancerr
4- right side just put seller info
5- admin show conversation buyer and seller. Block some words, and mobile number sharing.