Booking.com constantly nagged me into having my guests pay at the time they booked, through them. So I did that. Now they have advised that they are going to charge me for that, ON TOP of the whopping 15% they already get from me. This month I am still waiting (15th) for the payments due to me. This is a hopeless way to penalise small businesses. We cannot operate like this. I will be looking elsewhere as a result.