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Server/Data/SettingsData.cs

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+using System.Text.Json;
+using System.Text.Json.Serialization;
+using Server.Model;
+
+namespace Server.Data
+{
+    public class SettingsData
+    {
+        #region Public Properties
+
+        public static SettingsData Instance { get; set; } = new();
+
+        public Address SellerAddress { get; set; } = new();
+
+        public PaymentData PaymentData { get; set; } = new();
+        
+        public string? Comment { get; set; }
+
+        #endregion
+
+        #region Private Properties
+
+        private static string FileName => "Settings.json";
+
+        #endregion
+
+        #region Public Method Load
+
+        /// <summary>
+        ///     Asynchronously loads the settings from a JSON file and updates the current instance of <see cref="SettingsData" />.
+        /// </summary>
+        /// <returns>A task that represents the asynchronous load operation.</returns>
+        public static async Task LoadAsync()
+        {
+            if (!File.Exists(FileName)) return;
+            var jsonString = await File.ReadAllTextAsync(FileName);
+            var deserialized = JsonSerializer.Deserialize<SettingsData>(jsonString)!;
+
+            Instance = deserialized;
+        }
+
+        #endregion
+
+        #region Public Method SaveAsync
+
+        /// <summary>
+        ///     Serializes the current instance of <see cref="SettingsData" /> and saves it to a JSON file asynchronously.
+        /// </summary>
+        /// <returns>A task that represents the asynchronous save operation.</returns>
+        public static async Task SaveAsync()
+        {
+            var jsonString = JsonSerializer.Serialize(Instance, new JsonSerializerOptions { WriteIndented = true, DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull});
+            await File.WriteAllTextAsync(FileName, jsonString);
+        }
+
+        #endregion
+    }
+}