51cd1206_JSON_Web_Token__JWT___Claim_Syntax
[Claim Name] aud [JSON Value Type] string [Claim Semantics] The aud (audience) claim identifies the audience that the JWT is intended for. The principal intended to process the JWT MUST be identified with the value of the audience claim. If the principal processing the claim does not identify itself with the identifier in the aud claim value then the JWT MUST be rejected. The interpretation of the audience value is generally application specific. The aud 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