Costco has long had an iOS app, but the app did not include support for adding a digital version of the Costco membership card, instead requiring customers to present their actual cards for purchases.
According to a Reddit thread from May, Costco began testing the new Digital Membership Card in October with employees, and announced its upcoming rollout in the spring.
To use the Digital Membership Card, Costco customers can download the Costco app and sign into their Costco.com accounts to verify their membership. Once that's done, the Digital Membership Card is available through the new "Membership" tab in the app.
Along with offering a QR code that can be scanned at Costco, the Membership section of the app allows Executive Members to view their two percent reward balance and renew their memberships online.
The Costco Digital Membership app can't be added to the Apple Wallet app at this time unfortunately, but because Costco does accept Apple Pay, the addition of the Digital Membership Card to the Costco app allows customers to shop with just a smartphone. The Digital Card can be used to verify membership, while Apple Pay can be used for purchases.