What does MAU mean in the Chat API pricing plan?

MAU stands for Monthly Active Users, so this is the amount of unique users that you are chatting with a month’s time. If a client contacts you on 21 March for the first time, and they open another chat a week later on 28 March, then this counts as 1 MAU for the month of March. If they contact you again on the 1st of April though, this counts as 1 MAU for March and 1 for April.