Julio Song
Technical content writer, Passmint
Julio is a technical content writer at Passmint. He writes about Apple PassKit, the Google Wallet API, and what breaks when wallet passes meet production traffic.
32 articles
- // developersApple Wallet Passes in Python Without Wrestling OpenSSLSigning with the cryptography library instead of shelling out to the openssl binary, plus the Django route and the update service no Python package touches.
- // developersAdd to Apple Wallet in Next.js: the Route Handler, the Button, and the DownloadThe server route that signs the pass, the badge Apple requires you to use unmodified, and the caching bug that ships the wrong pass to a stranger.
- // developersGenerate an Apple Wallet Pass in Node.js, End to EndCertificates, the manifest, the signature, and the update web service: everything a Node.js Apple Wallet integration needs beyond generation.
- // industryThe Silent Churn Problem: Why Wallet Pass Opt-Out Rates Spike at 90 DaysDeletions cluster around day 90 with a consistency that suggests cause, not coincidence. What triggers the spike and how to flatten it.
- // industryApple Wallet vs. Google Wallet Pass Rendering in 2025: Why the Same Pass Looks and Behaves Differently on Each PlatformThe same pass definition produces two different-looking cards. Where the rendering diverges, and what each platform expects you to design for.
- // industryWhy Sports Teams Are Ditching Paper Tickets for Wallet PassesPaper tickets cost teams the one thing they need most: a direct line to the fan holding them. Wallet passes give it back.
- // industryHotel Key Cards Are Dying: How Apple Wallet & Google Wallet Passes Are Rewriting the Guest Experience (With Data)Plastic key cards demagnetize, get lost, and cost more than their sticker price. What replaces them, and what the switch actually looks like.
- // industryWhy QR-Based Loyalty Programs Are Losing to Wallet Passes: The Retention Data Brands Don't Want to IgnoreQR-based loyalty programs lose about 60% of enrollments within 90 days. The retention gap against wallet passes is not close.
- // industryWhy Retailers Are Replacing Paper Coupons with Wallet PassesPaper coupons redeem below 1%. Wallet coupons land between 12% and 18%. The gap is mostly about where the coupon sits when the decision happens.
- // industryApple's Expanding Wallet Pass Permissions in 2025: What Every Pass Issuer Needs to KnowApple tightened what a pass may ask for in 2025. What changed, what it breaks, and how to keep engagement without tripping the new limits.
- // industryWhat Every Industry Can Learn From How Airlines Mastered Mobile Boarding PassesAn IATA mandate in 2010 forced airlines onto one standard, and they were Day 1 partners when Apple launched Passbook. The design decisions behind that are the ones other industries are still getting wrong.
- // industryWhy Campus ID Programs Are the Unlikely Frontier of Apple and Google Wallet AdoptionStudent IDs are the most demanding wallet pass in production: door access, meal plans, payments, and library checkout on one credential.
- // industryThe Wallet Pass Metrics That Actually Matter (and the Ones Most Programs Track Instead)Install rates and push opens make a wallet pass program look healthy while it quietly shrinks. Here are the four numbers that predict whether it survives.
- // industryFrom Stamp Cards to Smart Passes: How Independent Coffee Shops Are Winning Back Customers with Google and Apple WalletThe paper stamp card works until it goes through the wash. Independent coffee shops are moving the same mechanic into Apple and Google Wallet.
- // industryThe Hidden Cost of App-Based Loyalty Programs (and Why Brands Are Quietly Switching to Wallet Passes)The build quote is the small number. Store fees, SDK upkeep, and the customers who never download it are where loyalty apps actually cost you.
- // industryWhy Healthcare Clinics Are Turning Appointment Cards into Apple and Google Wallet Passes and Cutting No-Shows by Up to 30%A missed appointment costs a clinic more than the visit was worth. Wallet appointment cards cut no-shows by up to 30% without a patient app.
- // industryHow Ticketmaster, AXS, and DICE Are Betting on Wallet Passes to Kill Ticket FraudHow major ticketing platforms use wallet passes to combat fraud. What event organizers need to know about the shift to mobile credentials.
- // industryWhy Hotels Are Ditching Key Cards for Apple and Google Wallet PassesThe adoption numbers behind hotels moving guests from plastic key cards to Apple Wallet and Google Wallet passes.
- // industryApple Wallet vs. Google Wallet in 2026: Which Platform Should Pass Issuers Prioritize?The platform question is not technical, it is strategic. How to pick between Apple Wallet and Google Wallet based on what your customers actually carry.
- // industryPush Notification Open Rates Are Dying, Except in Apple Wallet: What the Data Means for Marketers in 2026App push engagement has fallen to the low single digits while well-run wallet pass programs report 20-40%. Here is why the gap exists and where wallet messaging fits in a 2026 channel strategy.
- // industryBeyond the Loyalty Card: How Smart Retailers Are Using Wallet Passes to Transform One-Time Shoppers Into Loyal Repeat BuyersThe first purchase is the easy part. Wallet passes give retailers a way to reach the shopper again without an app or an inbox.
- // industryHow Regional Airlines Are Using Wallet Boarding Passes to Solve the Paper-Ticket Problem at Airports Without ScannersSmall airports often have no barcode scanner at the gate. Regional airlines are issuing wallet boarding passes anyway, and it still works.
- // industryThe Wallet Pass Compliance Checklist: Navigating GDPR, CCPA, and Apple/Google Platform Policies Without Killing Your ProgramWhat GDPR, CCPA, and the Apple and Google platform policies each require of a wallet pass program, as a checklist you can work through.
- // industryHow Museums and Cultural Institutions Are Using Wallet Passes to Boost Membership Renewals by 50%Museum memberships lapse quietly, because the card is in a drawer and the renewal email is in a promotions tab. A wallet pass sits where the member will see it.
- // industryHow Car Dealerships Cut Service No-Shows by 35% Without Building an AppService no-shows fall by around 35% when the appointment lives on the lock screen instead of in a voicemail. No dealership app required.
- // industryHow Gyms and Fitness Chains Replaced Plastic Membership Cards and Cut Front-Desk Bottlenecks by 40%The 6pm queue at the front desk is a check-in problem, not a staffing problem. Wallet membership passes cut that bottleneck by around 40%.
- // industryHow Healthcare Systems Are Using Wallet Passes for Patient Check-In, Insurance Cards, and Appointment RemindersPatient check-in, digital insurance cards, and appointment reminders, delivered to a phone the patient already carries instead of an app they will not install.
- // industryWhat Apple's Automatic Pass Updates and Google's Rotating Barcodes Mean for Anti-Fraud in 2025A screenshot of a static barcode works as well as the original. Apple and Google now attack that problem from two different directions.
- // industryHow Live Events and Festivals Are Using Wallet Passes to Cut No-Show Rates by Up to 30%A ticket buried in an inbox is a ticket that gets forgotten. Events using wallet passes report no-show rates falling by up to 30%.
- // industryThe Hidden Cost of Plastic: Why Hotels That Switch to Digital Room Keys See 22% Higher Guest Satisfaction ScoresHotels switching to digital room keys see 22% higher guest satisfaction. What drives the gap, and what a rollout actually costs.
- // industryThe Hidden Cost of Unused Loyalty Apps: Why Wallet Passes Deliver 4x Higher Monthly Active EngagementMost loyalty apps are installed once and never opened again. Wallet passes see roughly 4x the monthly active engagement at a fraction of the cost.
- // industryHow Quick-Service Restaurants Are Using Wallet Passes to Drive 3x More Repeat Visits Than App-Only StrategiesA $180K branded app ended up with about 1% of customers active monthly. A wallet stamp card reached well over a third of transactions among enrolled guests within 90 days.