Customer can't enter a discount code Your customers can use discount codes with Apple Pay only if they enter a discount code on the checkout page before clicking the Apple Pay button. If you show the Apple Pay button on the cart page, then your customers can't go to the checkout page to enter a discount code.
Enabling Apple Pay · Shopify Help Center
help.shopify.com > manual > payments > accelerated-checkouts > apple-pay
How to add a pass to Wallet
1. Use Wallet-enabled apps (Scroll down in Wallet, tap Edit Passes, and tap Find Apps for Wallet).*
2. Scan a barcode or QR code (Scroll down in Wallet, tap Edit Passes, tap Scan Code, and scan with your iPhone camera).*
How to use Wallet on your iPhone, iPod touch, and Apple Watch ... support.apple.com > en-us
Apple Pay users can get discounts at stores like PacSun, Persol, and Under Armour, with a full list of deals available below. Alice + Olivia - 20% off when spending $250 or more with promo code APPLEPAY. Deal is available on the website and in-store.
Apple Pay Promo Offers Spring Discounts at PacSun, Under ...
www.macrumors.com > 2021/05/13 > apple-pay-spring-promo
Option 2Add from an Email or Message If a Wallet-compatible pass is sent to you via email or messages — whether or not that pass has an associated iOS app or not — you can easily add it to Wallet. In your preferred email app, find the email containing the pass, and look for the "Add to Apple Wallet" icon.
How to Add Passes, Tickets, Rewards, Coupons, Gift Cards, IDs ...
ios.gadgethacks.com > how-to > add-passes-tickets-rewards-coupons-gift-c...