The cards are based onSMART Health Cards, which show clinical information used by several states and businesses.
Users can securely download and store their SMART Health Card information onto the Health app for ease of use.
Users in states that dont support SMART Health Cards still can enter their vaccination status manually.

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The feature is not restricted to only being used with the Health Cards.
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The focus on this feature looks like it’s the United States.
Apple does not mention whether or not this verification feature will go out to other countries.

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Users can sign up for the iOS15.1public betaon Apples website.