Walgreens will be the first merchant to integrate its loyalty program into the Apple Wallet/Apple Pay system, according to a press release. 

"We're excited to be the first to provide our customers with increased ease of access to their Balance Rewards account and information when using Apple Pay," said Sona Chawla, president of digital and chief marketing officer for Walgreens. "This offering supports our commitment to removing friction and enabling a simple and convenient customer experience."

Walgreens has more than 85 million active Balance Rewards members, according to the announcement.

To get the most out of purchases, users can simply add their Balance Rewards digital card to the Wallet app in iOS 9 and use it at checkout with Apple Pay. Members hold their iPhone near the contactless reader with a finger on Touch ID and the appropriate rewards information will be sent. On Apple Watch, they just double-click the side button, select their Balance Rewards card, and hold the face of Apple Watch up to the reader.