“This was strange in itself because I have IB” @Alex893
A request to book with IB on could mean a few things. If you have certain requirements set for IB guests to meet and they don’t, they can’t IB. Someone can correct me if I’m wrong, but if a guest has received a thumbs down from another host they can’t IB anymore (not sure if this is with any future host or just the one who thumbs downed). Either way, it can be a red flag, though certainly not always. Though in this case there is the added red flags of no communication and no payment confirmed.
What I do is message the guest to ask them what the delay is with payment. Usually they have a reasonable answer and it works out. If I were to receive no answer from the guest I would message again and ask them to withdraw their request/cancel their booking due to non payment, and that without payment completed, they would not be getting access to the house anyway.