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How can I know that the guest have made the payment or not
If the booking is confirmed that do you'll ask for advance payment or full payment
As how will I know that the payment made or noti need to collect from guest or from booking.co.
You should already know that as you have to sign up for a payment service either BdC or 3rdparty
Simply report to BdC Partner Support , see below 3 methods. They will never see any post on the Partner Hub.
Message or Call BdC PartnerSupport
Method 3: *** public main lines via Where you can reach us