/// <summary> /// Validates token and get single claim with specified ClaimType. /// this method throws an exception if there is more than one element in the sequence. /// </summary> /// <param name="token"></param> /// <param name="claimType"></param> /// <returns></returns> public Task <string> GetSingleClaimAsync(Token token, string claimType) => Task.FromResult(jwtTokenService.GetSingleClaim(token, claimType));