According to the Groups API documentation, it says "Groups can also be used to make chatrooms, parties, or any other persistent collection of entities." (
https://api.playfab.com/documentation/Groups)
I'm looking into building a Party system using the Groups API.
Suppose Player A is in a party with Player B.
Player A then invites Player C to join the party (group).
--> How do Players A and B find out about the fact that Player C just joined?
The only way I can currently think is to call ListGroupMembers every few seconds, but that seems like a bad idea for obvious reasons. Or use a dedicated server, but the whole reason I'm using the Groups API is to avoid doing everything on my dedicated server.