Sitecore - Google ReCaptcha V3

public class GoogleRecaptchaV3 : StringInputViewModel
    {
        public string ApiKey { get; set; }

        public string ErrorMessage { get; set; }

        protected override void InitItemProperties(Item item)
        {
            base.InitItemProperties(item);

            ApiKey = Sitecore.StringUtil.GetString(item.Fields["Api Key"]);
            ErrorMessage = Sitecore.StringUtil.GetString(item.Fields["Error Message"]);
        }

        protected override void UpdateItemFields(Item item)
        {
            base.UpdateItemFields(item);

            item.Fields["Api Key"].SetValue(ApiKey, true);
            item.Fields["Error Message"].SetValue(ErrorMessage, true);
        }
    }

public class CaptchaV3Validator : ValidationElement<string>
    {
        public override IEnumerable<ModelClientValidationRule> ClientValidationRules
        {
            get
            {
                if (string.IsNullOrEmpty(this.ApiKey))
                {
                    yield break;
                }
            }
        }

        protected virtual string ApiKey { get; set; }
        protected virtual string Title { get; set; }
        protected virtual string FieldName { get; set; }

        public CaptchaV3Validator(ValidationDataModel validationItem) : base(validationItem)
        {

        }

        public override void Initialize(object validationModel)
        {
            base.Initialize(validationModel);
            StringInputViewModel stringInputViewModel = validationModel as StringInputViewModel;
            if (stringInputViewModel != null)
            {
                var fieldItem = Sitecore.Context.Database.GetItem(ID.Parse(stringInputViewModel.ItemId));
                if (fieldItem != null)
                {
                    this.ApiKey = fieldItem["Api Key"];
                }
                this.Title = stringInputViewModel.Title;
                this.FieldName = stringInputViewModel.Name;
            }
        }

        public override ValidationResult Validate(object value)
        {
            if (value == null)
            {
                return new ValidationResult("Captcha is Inavlid.");// ValidationResult.Success;
            }
            var isCaptchaValid = ValidateCaptcha((string)value, this.ApiKey);
            if (!isCaptchaValid)
            {
                return new ValidationResult(this.FormatMessage(new object[] { this.Title }));
            }
            return ValidationResult.Success;
        }
        public static bool ValidateCaptcha(string response, string secret)
        {
            HttpClient httpClient = new HttpClient();

            var res = httpClient.GetAsync($"https://www.google.com/recaptcha/api/siteverify?secret=" + secret + "&response=" + response + "").Result;

            if (res.StatusCode != HttpStatusCode.OK)
                return false;

            string JSONres = res.Content.ReadAsStringAsync().Result;
            dynamic JSONdata = JObject.Parse(JSONres);

            if (JSONdata.success != "true")
                return false;

            return true;
        }
    }

@using Sitecore.ExperienceForms.Mvc.Html
@model Glass.Mapper.Training.FormFields.GoogleRecaptchaV3


<input id="@Html.IdFor(m => Model.Value)" name="@Html.NameFor(m => Model.Value)" class="@Model.CssClass" type="hidden" value="" />

<script src="https://www.google.com/recaptcha/api.js?onload=grecaptcha_ready&render=@Model.ApiKey"></script>
<script>
    function grecaptcha_ready() {
        grecaptcha.ready(function () {
            grecaptcha.execute('@Model.ApiKey', { action: 'form' }).then(function (token) {
                document.getElementById("@Html.IdFor(m => Model.Value)").value = token;
            });
        });
    }
    var hiddenField = document.getElementById(@Html.Raw("\"" + Html.IdFor(m => Model.Value) + "\""));
    var parent = hiddenField.parentNode;
    if (parent.classList.contains("sc-formdesign-fieldcontainer")) {
        var textDiv = document.createElement("div");
        textDiv.innerHTML = "(ReCaptcha V3 Hidden Field)";
        parent.appendChild(textDiv);
    }
</script>