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do we need to send mail with references for the confirmation of payment maid?

Hiya, So I have had a double booking and the guest who booked through Booking.com has requested to cancel. Booking.com have asked me if I wish to waive the fees

Hello, So, I have 2 situations: 1. I have received a first invoice for June with the commission from Booking but as far as I can calculate, I should only