Here's how Will call pickup works:
Just provide the credit card used at checkout along with the matching ID at the event's Will Call, which is located at the main entrance and usually open an hour prior to the event's start time.
If you will not be the one picking up your order, please visit this Support FAQ that will walk you through the transfer process with pictures:
Anyone may pick up this Will Call order. Just provide them with a clear photo of the credit card that was used at purchase, and the credit card holder's ID. They can simply show this as a photo on their smartphone, or on a paper printout.
If you are concerned about fraud, please black out everything but the last 4 digits of the credit card number, and the full name on the credit card and matching ID before you take the photo.