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I don't know if you've already seen this but if not it may be helpful to check out
TL;DR
The user is asking for help with chat functionality and mentions using the realtime service provided by Appwrite. They suggest considering the permission system in Appwrite to design the chat collections. They also recommend watching a YouTube video for additional guidance. 
Depends if you want 1to1 or 1 to many chat. Think about appwrite permission system to design your chat collections
And you'd probably use the realtime service: https://appwrite.io/docs/realtime
