This option can only be used in combination with the credit card guarantee for hotels.
In the Registration Data -> Payments you can see if the participant has paid for the registration. In the payment list you can find the status of the payment, but also the payment code.
Note: the credit card guarantees are only visible by the given IP address. For example: if the ip address from work is given, then the PCO is not able to see the payments from home.
Go to the Registration Data and choose for Hotel Reservations:
Click on 'View' and the next screen will appear:
In the screen is all the data you need for the credit card guarantee.