Apple's digital ID card support in iOS 15 may be convenient, but it also comes with tight requirements for the governments that use them. CNBC has learned states using Apple's system are required to not only run the platforms for issuing and checking credentials, but hire managers to handle Apple's requests and meet the iPhone maker's performance reporting expectations. States also have to "prominently" market the feature and encourage other government agencies (both state and federal) to adopt the technology.

Contracts are nearly identical for Arizona, Georgia, Kentucky and Oklahoma, some of the earliest adopters of the program. That suggests other states, including Connecticut, Iowa, Maryland and Utah, may have to honor similar terms.

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