Activating Universal Studios tickets purchased from Costco (which are usually "Buy a Day, Get the Rest of the Year Free" or multi-day passes) is a multi-step process that must be completed before your first visit. First, you must take the physical voucher or digital confirmation email provided by Costco and register it on the Universal Studios website or app. You will be asked to enter the unique 16-digit code found on your voucher, along with your personal details and a photo of yourself for biometric verification. Once registered, you will receive a digital "ticket" with a QR code. On the day of your first visit, you must bring this digital ticket and a valid government-issued photo ID to the turnstiles. The agent will scan your code and may take a thumbprint or another photo to link the pass to your identity. If you have an "Annual Pass" style ticket from Costco, you should also check for "Blockout Dates" before you go. This activation process is essential because the voucher itself is not a valid entry document; it is merely a proof of purchase that must be converted into an official Universal Studios credential to grant you access to the park.