Seems like this is another iteration of personalized promotions similar to what they do with MilePlay. Received an email the other day to use my club card for mobile wallet purchases (which I already do via ApplePay in the UA app...), but didn't think much of it until seeing this thread.
Register your card and use select digital wallets to earn 1,500 bonus miles after qualifying purchases
Lux, your digital wallet is a convenient, secure way to pay — in-store and online. Plus, you’ll still earn miles on every purchase made when using your United ClubSM Infinite Card within your digital wallet.
Follow these simple steps to earn 1,500 bonus miles:¹
1. Register your United ClubSM Infinite Card by January 31, 2024.
2. Add your eligible United ClubSM Infinite Card to your Apple Pay®, Google Pay™ or Samsung Pay digital wallet.
3. Then make 5 or more purchases using your card within select digital wallets in each of the following months: January, February and March 2024.
Sent here for enrollment:
https://promo.united.com/offers/MobileWallet