If you have named the person collecting the tickets on the booking as the customer and supplies valid ID such as a passport or driver's license then there will be no problem when collecting their tickets.
If the card holder is not attending on the day, they will need to provide a signed letter of authorisation to the named person collecting the tickets, including the following details: "I *name of card holder* authorise *name of person collecting tickets* to collect the tickets from order number *booking reference* paid for by my card *last for digits of credit card used*.
The named person collecting the tickets will also need to bring valid photo ID along with the signed letter.