# Constants
AuthorizationTokenKey - if the user use an authorization, this is the key of this element in the Header.
UIDParameterKey - use this value to get the user PublisherID store in the context parameters.
# Structs
JWTMiddleware Middleware struct that contains a *auth.Client that is used to check if the JWT token
// present in the header are valid Token.
# Interfaces
ThemisJWTMiddlewareProtocol - jwt middleware protocol.