Advice please - how and when do you view credit card details (I am a new paartner)

I have written for advice through the extranet but so far no reply so thought I'd use the partners forum. When a guest provides card details to booking.com (I'm not on the managed service) - when should I view the credit card details and how do you do this - is it when they book or on the day of check-in? There is currently writing in red saying I'm not authorised to view the details but they have been supplied to booking.com - so I'm a bit confused as to whether I will be able to view them. Thanks