IFEMA Madrid needs to develop a process that allows to collect the assistance confirmation of preference clients that have been invited to a private F1 event.
Solution
The CloudPage will identify the client, if it is not in the Data Base for the event, it will display a KO. If the person is in the Data Base and confirms assistance, it will display a OK.
If the client tries to confirm more than once, it will display "You have already confirmed your attendance".