IME PG will ask for the credit card. Last year when the exact same thing happened to me, I ignored the request to destroy my credit card and put it in my travel wallet. Sure enough, at check-in I was asked to produce the now invalid and useless credit card that I had originally purchased the ticket with. Had I not had the card I would have had to buy a new ticket at check-in.

I would call or e-mail PG and see how this can be dealt with in advance.