private void FillSettings(AccessDataEntity accessData, uint projectId, string transactionId)
 {
     accessData.settings = new AccessDataEntity.Settings
     {
         project_id         = projectId,
         currency           = "USD",
         mode               = XsollaSettings.IsSandbox ? "sandbox" : null,
         external_id        = transactionId,
         xsolla_product_tag = PaymentsHelper.GetAdditionalInformation("simplified"),
         ui = new AccessDataEntity.Settings.UI
         {
             size  = "medium",
             theme = PaystationThemeHelper.ConvertToSettings(XsollaSettings.PaystationTheme)
         }
     };
 }
        /// <summary>
        /// Executes a CloudScript function.
        /// This cloud script allows to open purchase url with one item.
        /// </summary>
        /// <see cref="https://docs.microsoft.com/ru-ru/rest/api/playfab/client/server-side-cloud-script/executecloudscript?view=playfab-rest"/>
        /// <param name="itemId">Unique identifier of the item to purchase.</param>
        /// <param name="orderId">Purchase order identifier.</param>
        /// <param name="onSuccess">Success operation callback.</param>
        /// <param name="onError">Failed operation callback.</param>
        private void ExecuteCloudScript(string itemId, string orderId,
                                        [NotNull] Action <CloudScriptResultEntity> onSuccess, [CanBeNull] Action <Error> onError = null)
        {
            var url     = PlayfabApi.GetFormattedUrl(URL_CLOUD_SCRIPT);
            var headers = new List <WebRequestHeader> {
                PlayfabApi.Instance.GetAuthHeader()
            };

            WebRequestHelper.Instance.PostRequest(url, new CloudScriptRequestEntity
            {
                FunctionName      = CLOUD_SCRIPT_DEMO_METHOD,
                FunctionParameter = new CloudScriptRequestEntity.CloudScriptArgs
                {
                    sku     = itemId,
                    amount  = ITEMS_QUANTITY_FOR_CLOUD_SCRIPT,
                    orderId = orderId,
                    sdkTag  = PaymentsHelper.GetAdditionalInformation("playfab"),
                    theme   = PaystationThemeHelper.ConvertToSettings(XsollaSettings.PaystationTheme),
                    sandbox = XsollaSettings.IsSandbox
                }
            }, headers, (CloudScriptResponseEntity response) => onSuccess?.Invoke(response.data), onError);
        }