We need to add a feature where two players sends a message, and when both players have done so, the server determines the resulting change to player statistics. Not totally unsimilar to https://community.playfab.com/questions/10657/auction-system-possible.html
The answer then (2017) was that a custom game server could be used for this. Is that still the answer, or is there now a featuer in for instance CloudScript that could achieve the same thing?