Google is weighing changes aimed at improving its Google Wallet mobile-payment system following slow adoption and the departure of two key managers, according to people with knowledge of the project.

The company is considering sharing revenue with carriers such as Verizon Wireless and AT&T to get them to embrace the technology, which lets users pay for items at checkout by tapping phones on a reader device, said the people, who asked not to be named because the discussions are private…

“They are in a bit of a re-evaluation pattern right now,” said Rick Oglesby, an analyst at Boston-based research firm Aite Group. “It’s going much slower than anticipated.”