I just purchased 4 tickets to the show in Pittsburgh but used my moms credit card. Even though she isn't attending can I just take her credit card and use my ID?
If you go to the News section on the site here, read the story about Paperless Tickets. There is a link posted that answers questions. I believe that question is answered on there.
The last time I went to a concert with paperless tickets was when I took my daughter to Miley Cyrus. If I remember correctly, they didn't even look at my ID to match it to the credit card. There are too many people trying to get in the door that I don't think they are going to be checking them. All they did was scan the credit card through a handheld machine and it printed out a receipt(ticket) that showed your assigned seat. I'm sure you'll be ok but you may want to call the actual venue and ask.
no guarantees, but that is how I've done most of my "Will Call" tickets. BUT since this is different, I don't think anyone is 100% sure. As long as you have both and ID and card, I think you would be good.