subject

The principal about which the token asserts information, such as the user of an app. This value is immutable and cannot be reassigned or reused. The subject is a pairwise identifier - it is unique to a particular application ID. If a single user signs into two different apps using two different client IDs, those apps will receive two different values for the subject claim. This may or may not be wanted depending on your architecture and privacy requirements.

let subject: SubjectClaim