private async Task <string> GetNewAccessTokenAsync() { var refreshTokenString = await _localStorage.GetRefreshTokenAsync(); var refreshToken = new JwtSecurityToken(refreshTokenString); if (VerifyTokenLifetime(refreshToken)) { var query = new GetAccessTokenQuery { JwtRefreshToken = refreshTokenString, Thumbprint = "12345" }; return(await _mediator.Send(query)); } return(null); }