I had a voucher from Last Minute Travel Club with a barcode. Before I went to Disney I added the barcode to the
Disneyland Ap and named the ticket.
If your voucher has a barcode, go direct to the entrance turnstiles after security.
Present the vouchers to the CM who will scan then and print out the actaul Disneyland paper ticket which is the size of a credit card. If you have added the tickets to the App you need to match up the tickets with the person. Get each person to write their names on the tickets.
I used a plastic lanyard pouch attached to a belt clip with a retractable cord, this type of thing
I had this attached to one of the bag straps of my backpack.
Put the park ticket into the plastic pouch and attach to each person in a place which is easy to reach.
I didnt use Maxpass and used my ticket to pull the paper fastpasses from the machines. The paper fastpasses are just a receipt with the info on them. You do not have to give them to the CM's. I kept the Fastpass paper receipts in the plastic pouch. I was able to keep track of the Fastpass return windows and when my next Fastpass would be available by checking the paper fastpass receipt.
When I then went to use the Fastpass I just reached for the plastic pouch and scanned the actual park ticket through the plastic. I didnt have to remove it from the pouch.