Restructured the project structure back to the way it was, there's no reasonable way to split the modules

src/NadekoBot/_common/Patronage/IPatronageService.cs

@@ -0,0 +1,56 @@
+using NadekoBot.Db.Models;
+using OneOf;
+
+namespace NadekoBot.Modules.Patronage;
+
+/// <summary>
+/// Manages patrons and provides access to their data  
+/// </summary>
+public interface IPatronageService
+{
+    /// <summary>
+    /// Called when the payment is made.
+    /// Either as a single payment for that patron,
+    /// or as a recurring monthly donation.
+    /// </summary>
+    public event Func<Patron, Task> OnNewPatronPayment;
+    
+    /// <summary>
+    /// Called when the patron changes the pledge amount
+    /// (Patron old, Patron new) => Task
+    /// </summary>
+    public event Func<Patron, Patron, Task> OnPatronUpdated;
+    
+    /// <summary>
+    /// Called when the patron refunds the purchase or it's marked as fraud
+    /// </summary>
+    public event Func<Patron, Task> OnPatronRefunded;
+
+    /// <summary>
+    /// Gets a Patron with the specified userId
+    /// </summary>
+    /// <param name="userId">UserId for which to get the patron data for.</param>
+    /// <returns>A patron with the specifeid userId</returns>
+    public Task<Patron> GetPatronAsync(ulong userId);
+    
+    /// <summary>
+    /// Gets the quota statistic for the user/patron specified by the userId
+    /// </summary>
+    /// <param name="userId">UserId of the user for which to get the quota statistic for</param>
+    /// <returns>Quota stats for the specified user</returns>
+    Task<UserQuotaStats> GetUserQuotaStatistic(ulong userId);
+
+    
+    Task<FeatureLimit> TryGetFeatureLimitAsync(FeatureLimitKey key, ulong userId, int? defaultValue);
+
+    ValueTask<OneOf<(uint Hourly, uint Daily, uint Monthly), QuotaLimit>> TryIncrementQuotaCounterAsync(
+        ulong userId,
+        bool isSelf,
+        FeatureType featureType,
+        string featureName,
+        uint? maybeHourly,
+        uint? maybeDaily,
+        uint? maybeMonthly);
+
+    PatronConfigData GetConfig();
+}