I have a reservation but only 50% from actual price for today what does it mean?

In February I’ve received 3 reservations, but was only received the payment from the last reservation. Now I have a message from booking charging me the

So this is a peculiar one. Today I had a message from a guest whom has technically not checked in or stayed yet. A polish guy who made the booking. He requested

Hi everyone, My property is in South Africa and, due to increased security measures, I can not charge the credit card without the guest approving it on their