JWTError extension with own errors

JWTErrorExtensions.swift

import JWT

extension JWTError {
    static let payloadCreation = JWTError(identifier: "TokenHelpers.createPayload", reason: "User ID not found")
    static let createJWT = JWTError(identifier: "TokenHelpers.createJWT", reason: "Error getting token string")
    static let verificationFailed = JWTError(identifier: "TokenHelpers.verifyToken", reason: "JWT verification failed")
}