diff --git a/src/Services/Subscriptions/ISubscriptionTracker.cs b/src/Services/Subscriptions/ISubscriptionTracker.cs
new file mode 100644
index 00000000..9a76db1b
--- /dev/null
+++ b/src/Services/Subscriptions/ISubscriptionTracker.cs
@@ -0,0 +1,136 @@
+namespace WhMgr.Services.Subscriptions
+{
+    using System.Collections.Generic;
+
+    using WhMgr.Common;
+
+    // TODO: Cache in memory and save to database every x minutes/hours
+
+    public interface ISubscriptionTrackerService
+    {
+        Dictionary<(ulong, ulong), Dictionary<SubscriptionTrackerType, ISubscriptionTracker>> Trackers { get; }
+    }
+
+    public class SubscriptionTrackerService : ISubscriptionTrackerService
+    {
+        public Dictionary<(ulong, ulong), Dictionary<SubscriptionTrackerType, ISubscriptionTracker>> Trackers { get; }
+
+        // TODO: Singleton
+
+        public SubscriptionTrackerService()
+        {
+            Trackers = new();
+        }
+
+        public void Increment((ulong, ulong) userKey, SubscriptionTrackerType trackerType, uint amount)
+        {
+            //var userKey = (guildId, userId);
+            if (!Trackers.ContainsKey(userKey))
+            {
+                var trackerManifest = BuildDefaultTrackerManifest();
+                Trackers.Add(userKey, trackerManifest);
+            }
+            else
+            {
+                ((SubscriptionTracker)Trackers[userKey][trackerType]).Count += amount;
+            }
+        }
+
+        private static Dictionary<SubscriptionTrackerType, ISubscriptionTracker> BuildDefaultTrackerManifest()
+        {
+            return new Dictionary<SubscriptionTrackerType, ISubscriptionTracker>
+            {
+                { SubscriptionTrackerType.Pokemon, new SubscriptionTracker() },
+                { SubscriptionTrackerType.PvP, new SubscriptionTracker() },
+                { SubscriptionTrackerType.Raids, new SubscriptionTracker() },
+                { SubscriptionTrackerType.Quests, new SubscriptionTracker() },
+                { SubscriptionTrackerType.Invasions, new SubscriptionTracker() },
+                { SubscriptionTrackerType.Lures, new SubscriptionTracker() },
+                { SubscriptionTrackerType.Gyms, new SubscriptionTracker() },
+            };
+        }
+    }
+
+
+    public interface ISubscriptionTracker
+    {
+        ulong GuildId { get; }
+
+        ulong UserId { get; }
+
+        ulong Count { get; }
+    }
+
+    public interface IPokemonSubscriptionTracker : ISubscriptionTracker
+    {
+        uint PokemonId { get; }
+    }
+
+    public interface IPvpSubscriptionTracker : IPokemonSubscriptionTracker
+    {
+        bool IsGreatLeague { get; }
+
+        bool IsUltraLeague { get; }
+
+        uint Rank { get; }
+    }
+
+    public interface IRaidSubscriptionTracker : IPokemonSubscriptionTracker
+    {
+        ushort Level { get; }
+    }
+
+
+    public interface IPokestopSubscriptionTracker : ISubscriptionTracker
+    {
+        string PokestopName { get; }
+    }
+
+
+    public interface IQuestSubscriptionTracker : IPokestopSubscriptionTracker
+    {
+        string RewardKeyword { get; }
+    }
+
+    public interface IInvasionSubscriptionTracker : IPokestopSubscriptionTracker
+    {
+        ushort GruntType { get; }
+
+        uint RewardPokemonId { get; }
+    }
+
+    public interface ILureSubscriptionTracker : IPokestopSubscriptionTracker
+    {
+        PokestopLureType LureType { get; }
+    }
+
+    public interface IGymSubscriptionTracker : ISubscriptionTracker
+    {
+        string GymName { get; }
+
+        ushort Level { get; }
+
+        uint PokemonId { get; }
+    }
+
+
+    public class SubscriptionTracker : ISubscriptionTracker
+    {
+        public ulong GuildId { get; set; }
+
+        public ulong UserId { get; set; }
+
+        public ulong Count { get; set; }
+    }
+
+    public enum SubscriptionTrackerType
+    {
+        Pokemon,
+        PvP,
+        Raids,
+        Quests,
+        Invasions,
+        Lures,
+        Gyms,
+    }
+}
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