You can pay by card through Wishtender. This is a convenient payment methods that is anonymous for clients (the receiver can not see your data).
You can pay with Bitcoin or other crypto through SpankPay. It’s a convenient payment method that’s anonymous for clients (the receiver can’t see your data). You may learn more about SpankPay here.
The remaining amount for the meeting should be paid at the beginning of the meeting by one of those methods: