public IActionResult CreateToken()
{
var captcha = _captchaService.CreateCaptcha(new CaptchaOptions()
{
ImgWidth = 216,
ImgHeight = 96,
MinCharsLength = 5,
MaxCharsLength = 10,
BackgroundColor = "#fff",
FontColor = "#337ab7"
});
return(Json(captcha.Id));
}