Can ask user to confirm email

BTCPayServer/Services/SettingsRepository.cs

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+using BTCPayServer.Data;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Identity.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore;
+using BTCPayServer.Models;
+using Microsoft.EntityFrameworkCore.Infrastructure.Internal;
+using Newtonsoft.Json;
+
+namespace BTCPayServer.Services
+{
+	public class SettingsRepository
+	{
+		private ApplicationDbContextFactory _ContextFactory;
+		public SettingsRepository(ApplicationDbContextFactory contextFactory)
+		{
+			_ContextFactory = contextFactory;
+		}
+
+		public async Task<T> GetSettingAsync<T>()
+		{
+			var name = typeof(T).FullName;
+			using(var ctx = _ContextFactory.CreateContext())
+			{
+				var data = await ctx.Settings.Where(s => s.Id == name).FirstOrDefaultAsync();
+				if(data == null)
+					return default(T);
+				return Deserialize<T>(data.Value);
+			}
+		}
+
+		public async Task UpdateSetting<T>(T obj)
+		{
+			var name = obj.GetType().FullName;
+			using(var ctx = _ContextFactory.CreateContext())
+			{
+				var settings = new SettingData();
+				settings.Id = name;
+				settings.Value = Serialize(obj);
+				ctx.Attach(settings);
+				ctx.Entry(settings).State = EntityState.Modified;
+				try
+				{
+					await ctx.SaveChangesAsync();
+				}
+				catch(DbUpdateException)
+				{
+					ctx.Entry(settings).State = EntityState.Added;
+					await ctx.SaveChangesAsync();
+				}
+			}
+		}
+
+		private T Deserialize<T>(string value)
+		{
+			return JsonConvert.DeserializeObject<T>(value);
+		}
+
+		private string Serialize<T>(T obj)
+		{
+			return JsonConvert.SerializeObject(obj);
+		}
+	}
+}