Do they check your credit/debit card when you attend a gig in Hyde Park?

I'm attending a gig in Hyde Park next week and have e-tickets for it.
I was wondering what the procedure is when entering the grounds. Do
they just check your ticket is valid or do they check your payment
card? I ask because I may have some friends turn up late and they have
tickets that I'd for and have my name on them.

Any help appreciated. Thanks.