1) It is to simplify that I speak about the first day of the month... With a normal rental contract, I have 3 weeks to react, if the tenant does not pay, because he has to pay 3 weeks in advance. You write that with Airbnb, you are informed on the "day of payment", that is, to be clear, you are informed of a payment problem 0 days in advance, because you only receive the payment from Airbnb in advance.
2) Why is this information not known to guests - and why do you have to ask a guest to get an answer?