51cd1206_JSON_Web_Token__JWT___Claim_Syntax
[Claim Name] prn [JSON Value Type] string [Claim Semantics] The prn (principal) claim identifies the subject of the JWT. The processing of this claim is generally application specific. The prn value is case sensitive. This claim is OPTIONAL. [Claim Syntax] 
StringOrURI
I n t D a t e
S t r i n g O r U R I
S t r i n g
JSON Web Token (JWT)
Claim Syntax