[Feature] Premium subscriptions (#2781)

* what a big commit lel, add app sub enums

* work

* ah yup lol

* `?`

* events 1

* typo

* `list` => `get` | remaining events

* add `RespondWithPremiumRequiredAsync` to interaction module base

src/Discord.Net.Core/DiscordConfig.cs

@@ -237,5 +237,10 @@ namespace Discord
         ///     Returns the max amount of tags applied to an application.
         /// </summary>
         public const int MaxApplicationTagCount = 5;
+
+        /// <summary>
+        ///     Returns the maximum number of entitlements that can be gotten per-batch.
+        /// </summary>
+        public const int MaxEntitlementsPerBatch = 100;
     }
 }

src/Discord.Net.Core/Entities/AppSubscriptions/EntitlementType.cs

@@ -0,0 +1,9 @@
+namespace Discord;
+
+public enum EntitlementType
+{
+    /// <summary>
+    ///     The entitlement was purchased as an app subscription.
+    /// </summary>
+    ApplicationSubscription = 8
+}

src/Discord.Net.Core/Entities/AppSubscriptions/IEntitlement.cs

@@ -0,0 +1,61 @@
+using System;
+
+namespace Discord;
+
+public interface IEntitlement : ISnowflakeEntity
+{
+    /// <summary>
+    ///     Gets the ID of the SKU this entitlement is for.
+    /// </summary>
+    ulong SkuId { get; }
+
+    /// <summary>
+    ///     Gets the ID of the user that is granted access to the entitlement's SKU.
+    /// </summary>
+    /// <remarks>
+    ///     <see langword="null"/> if the entitlement is for a guild.
+    /// </remarks>
+    ulong? UserId { get; }
+
+    /// <summary>
+    ///     Gets the ID of the guild that is granted access to the entitlement's SKU.
+    /// </summary> 
+    /// <remarks>
+    ///     <see langword="null"/> if the entitlement is for a user.
+    /// </remarks>
+    ulong? GuildId { get; }
+
+    /// <summary>
+    ///     Gets the ID of the parent application.
+    /// </summary>
+    ulong ApplicationId { get; }
+
+    /// <summary>
+    ///     Gets the type of the entitlement.
+    /// </summary>
+    EntitlementType Type { get; }
+
+    /// <summary>
+    ///     Gets whether this entitlement has been consumed.
+    /// </summary>
+    /// <remarks>
+    ///     Not applicable for App Subscriptions.
+    /// </remarks>
+    bool IsConsumed { get; }
+
+    /// <summary>
+    ///     Gets the start date at which the entitlement is valid.
+    /// </summary>
+    /// <remarks>
+    ///     <see langword="null"/> when using test entitlements.
+    /// </remarks>
+    DateTimeOffset? StartsAt { get; }
+
+    /// <summary>
+    ///     Gets the end date at which the entitlement is no longer valid.
+    /// </summary>
+    /// <remarks>
+    ///     <see langword="null"/> when using test entitlements.
+    /// </remarks>
+    DateTimeOffset? EndsAt { get; }
+}

src/Discord.Net.Core/Entities/AppSubscriptions/SKU.cs

@@ -0,0 +1,41 @@
+using System;
+
+namespace Discord;
+
+public struct SKU : ISnowflakeEntity
+{
+    /// <inheritdoc />
+    public ulong Id { get; }
+
+    /// <inheritdoc />
+    public DateTimeOffset CreatedAt => SnowflakeUtils.FromSnowflake(Id);
+
+    /// <summary>
+    ///     Gets the type of the SKU.
+    /// </summary>
+    public SKUType Type { get; }
+
+    /// <summary>
+    ///     Gets the ID of the parent application.
+    /// </summary>
+    public ulong ApplicationId { get; }
+
+    /// <summary>
+    ///     Gets the customer-facing name of your premium offering.
+    /// </summary>
+    public string Name { get; }
+
+    /// <summary>
+    ///     Gets the system-generated URL slug based on the SKU's name.
+    /// </summary>
+    public string Slug { get; }
+
+    internal SKU(ulong id, SKUType type, ulong applicationId, string name, string slug)
+    {
+        Id = id;
+        Type = type;
+        ApplicationId = applicationId;
+        Name = name;
+        Slug = slug;
+    }
+}

src/Discord.Net.Core/Entities/AppSubscriptions/SKUFlags.cs

@@ -0,0 +1,11 @@
+using System;
+
+namespace Discord;
+
+[Flags]
+public enum SKUFlags
+{
+    GuildSubscription = 1 << 7,
+
+    UserSubscription = 1 << 8
+}

src/Discord.Net.Core/Entities/AppSubscriptions/SKUType.cs

@@ -0,0 +1,14 @@
+namespace Discord;
+
+public enum SKUType
+{
+    /// <summary>
+    ///     Represents a recurring subscription.
+    /// </summary>
+    Subscription = 5,
+
+    /// <summary>
+    ///     System-generated group for each <see cref="SKUType.Subscription"/> SKU created.
+    /// </summary>
+    SubscriptionGroup = 6,
+}

src/Discord.Net.Core/Entities/AppSubscriptions/SubscriptionOwnerType.cs

@@ -0,0 +1,14 @@
+namespace Discord;
+
+public enum SubscriptionOwnerType
+{
+    /// <summary>
+    ///     The owner of the application subscription is a guild.
+    /// </summary>
+    Guild = 1,
+
+    /// <summary>
+    ///     The owner of the application subscription is a user.
+    /// </summary>
+    User = 2,
+}

src/Discord.Net.Core/Entities/Interactions/IDiscordInteraction.cs

@@ -91,6 +91,11 @@ namespace Discord
         /// </summary>
         ulong ApplicationId { get; }
 
+        /// <summary>
+        ///     Gets entitlements for the invoking user.
+        /// </summary>
+        IReadOnlyCollection<IEntitlement> Entitlements { get; }
+
         /// <summary>
         ///     Responds to an Interaction with type <see cref="InteractionResponseType.ChannelMessageWithSource"/>.
         /// </summary>
@@ -368,5 +373,12 @@ namespace Discord
         /// <param name="options">The request options for this <see langword="async"/> request.</param>
         /// <returns>A task that represents the asynchronous operation of responding to the interaction.</returns>
         Task RespondWithModalAsync(Modal modal, RequestOptions options = null);
+
+        /// <summary>
+        ///     Responds to the interaction with an ephemeral message the invoking user,
+        ///     instructing them that whatever they tried to do requires the premium benefits of your app.
+        /// </summary>
+        /// <returns>A task that represents the asynchronous operation of responding to the interaction.</returns>
+        Task RespondWithPremiumRequiredAsync(RequestOptions options = null);
     }
 }

src/Discord.Net.Core/Entities/Interactions/InteractionResponseType.cs

@@ -47,5 +47,10 @@ namespace Discord
         ///     Respond by showing the user a modal.
         /// </summary>
         Modal = 9,
+
+        /// <summary>
+        ///     Respond to an interaction with an upgrade button, only available for apps with monetization enabled.
+        /// </summary>
+        PremiumRequired = 10
     }
 }

src/Discord.Net.Core/IDiscordClient.cs

@@ -327,5 +327,27 @@ namespace Discord
         ///     that represents the gateway information related to the bot.
         /// </returns>
         Task<BotGateway> GetBotGatewayAsync(RequestOptions options = null);
+
+        /// <summary>
+        ///     Creates a test entitlement to a given SKU for a given guild or user. 
+        /// </summary>
+        Task<IEntitlement> CreateTestEntitlementAsync(ulong skuId, ulong ownerId, SubscriptionOwnerType ownerType, RequestOptions options = null);
+
+        /// <summary>
+        ///     Deletes a currently-active test entitlement.
+        /// </summary>
+        Task DeleteTestEntitlementAsync(ulong entitlementId, RequestOptions options = null);
+
+        /// <summary>
+        ///     Returns all entitlements for a given app, active and expired.
+        /// </summary>
+        IAsyncEnumerable<IReadOnlyCollection<IEntitlement>> GetEntitlementsAsync(int? limit = 100,
+            ulong? afterId = null, ulong? beforeId = null, bool excludeEnded = false, ulong? guildId = null, ulong? userId = null,
+            ulong[] skuIds = null, RequestOptions options = null);
+
+        /// <summary>
+        ///     Returns all SKUs for a given application. 
+        /// </summary>
+        Task<IReadOnlyCollection<SKU>> GetSKUsAsync(RequestOptions options = null);
     }
 }

src/Discord.Net.Interactions/InteractionModuleBase.cs

@@ -123,6 +123,10 @@ namespace Discord.Interactions
         protected virtual async Task RespondWithModalAsync<TModal>(string customId, RequestOptions options = null) where TModal : class, IModal
             => await Context.Interaction.RespondWithModalAsync<TModal>(customId, options);
 
+        /// <inheritdoc cref="IDiscordInteraction.RespondWithPremiumRequiredAsync(RequestOptions)"/>
+        protected virtual Task RespondWithPremiumRequiredAsync(RequestOptions options = null)
+            => Context.Interaction.RespondWithPremiumRequiredAsync(options);
+
         //IInteractionModuleBase
 
         /// <inheritdoc/>

src/Discord.Net.Rest/API/Common/Entitlement.cs

@@ -0,0 +1,34 @@
+using Newtonsoft.Json;
+using System;
+
+namespace Discord.API;
+
+internal class Entitlement
+{
+    [JsonProperty("id")]
+    public ulong Id { get; set; }
+
+    [JsonProperty("sku_id")]
+    public ulong SkuId { get; set; }
+
+    [JsonProperty("user_id")]
+    public Optional<ulong> UserId { get; set; }
+
+    [JsonProperty("guild_id")]
+    public Optional<ulong> GuildId { get; set; }
+
+    [JsonProperty("application_id")]
+    public ulong ApplicationId { get; set; }
+
+    [JsonProperty("type")]
+    public EntitlementType Type { get; set; }
+
+    [JsonProperty("consumed")]
+    public bool IsConsumed { get; set; }
+
+    [JsonProperty("starts_at")]
+    public Optional<DateTimeOffset> StartsAt { get; set; }
+
+    [JsonProperty("ends_at")]
+    public Optional<DateTimeOffset> EndsAt { get; set; }
+}

src/Discord.Net.Rest/API/Common/Interaction.cs

@@ -46,5 +46,8 @@ namespace Discord.API
 
         [JsonProperty("guild_locale")]
         public Optional<string> GuildLocale { get; set; }
+
+        [JsonProperty("entitlements")]
+        public Entitlement[] Entitlements { get; set; }
     }
 }

src/Discord.Net.Rest/API/Common/SKU.cs

@@ -0,0 +1,21 @@
+using Newtonsoft.Json;
+
+namespace Discord.API;
+
+internal class SKU
+{
+    [JsonProperty("id")]
+    public ulong Id { get; set; }
+
+    [JsonProperty("type")]
+    public SKUType Type { get; set; }
+
+    [JsonProperty("application_id")]
+    public ulong ApplicationId { get; set; }
+
+    [JsonProperty("name")]
+    public string Name { get; set; }
+
+    [JsonProperty("slug")]
+    public string Slug { get; set; }
+}

src/Discord.Net.Rest/API/Rest/CreateEntitlementParams.cs

@@ -0,0 +1,15 @@
+using Newtonsoft.Json;
+
+namespace Discord.API.Rest;
+
+internal class CreateEntitlementParams
+{
+    [JsonProperty("sku_id")]
+    public ulong SkuId { get; set; }
+
+    [JsonProperty("owner_id")]
+    public ulong OwnerId { get; set; }
+
+    [JsonProperty("owner_type")]
+    public SubscriptionOwnerType Type { get; set; }
+}

src/Discord.Net.Rest/API/Rest/ListEntitlementsParams.cs

@@ -0,0 +1,18 @@
+namespace Discord.API.Rest;
+
+internal class ListEntitlementsParams
+{
+    public Optional<ulong> UserId { get; set; }
+
+    public Optional<ulong[]> SkuIds { get; set; }
+
+    public Optional<ulong> BeforeId { get; set; }
+
+    public Optional<ulong> AfterId { get; set; }
+
+    public Optional<int> Limit { get; set; }
+
+    public Optional<ulong> GuildId { get; set; }
+
+    public Optional<bool> ExcludeEnded { get; set; }
+}

src/Discord.Net.Rest/BaseDiscordClient.cs

@@ -3,6 +3,7 @@ using System;
 using System.Collections.Generic;
 using System.Collections.Immutable;
 using System.IO;
+using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
 
@@ -258,6 +259,30 @@ namespace Discord.Rest
         /// <inheritdoc />
         Task IDiscordClient.StopAsync()
             => Task.Delay(0);
+
+        /// <summary>
+        ///     Creates a test entitlement to a given SKU for a given guild or user.
+        /// </summary>
+        Task<IEntitlement> IDiscordClient.CreateTestEntitlementAsync(ulong skuId, ulong ownerId, SubscriptionOwnerType ownerType, RequestOptions options)
+            => Task.FromResult<IEntitlement>(null);
+
+        /// <summary>
+        ///     Deletes a currently-active test entitlement.
+        /// </summary>
+        Task IDiscordClient.DeleteTestEntitlementAsync(ulong entitlementId, RequestOptions options)
+            => Task.CompletedTask;
+
+        /// <summary>
+        ///     Returns all entitlements for a given app.
+        /// </summary>
+        IAsyncEnumerable<IReadOnlyCollection<IEntitlement>> IDiscordClient.GetEntitlementsAsync(int? limit, ulong? afterId, ulong? beforeId,
+            bool excludeEnded, ulong? guildId, ulong? userId, ulong[] skuIds, RequestOptions options) => AsyncEnumerable.Empty<IReadOnlyCollection<IEntitlement>>();
+
+        /// <summary>
+        ///     Gets all SKUs for a given application.
+        /// </summary>
+        Task<IReadOnlyCollection<SKU>> IDiscordClient.GetSKUsAsync(RequestOptions options) => Task.FromResult<IReadOnlyCollection<SKU>>(Array.Empty<SKU>());
+
         #endregion
     }
 }

src/Discord.Net.Rest/ClientHelper.cs

@@ -379,6 +379,66 @@ namespace Discord.Rest
         }
 
 
+        #endregion
+
+        #region App Subscriptions
+
+        public static async Task<RestEntitlement> CreateTestEntitlementAsync(BaseDiscordClient client, ulong skuId, ulong ownerId, SubscriptionOwnerType ownerType,
+            RequestOptions options = null)
+        {
+            var model = await client.ApiClient.CreateEntitlementAsync(new CreateEntitlementParams
+            {
+                Type = ownerType,
+                OwnerId = ownerId,
+                SkuId = skuId
+            }, options);
+
+            return RestEntitlement.Create(client, model);
+        }
+
+        public static IAsyncEnumerable<IReadOnlyCollection<RestEntitlement>> ListEntitlementsAsync(BaseDiscordClient client, int? limit = 100,
+            ulong? afterId = null, ulong? beforeId = null, bool excludeEnded = false, ulong? guildId = null, ulong? userId = null,
+             ulong[] skuIds = null, RequestOptions options = null)
+        {
+            return new PagedAsyncEnumerable<RestEntitlement>(
+                DiscordConfig.MaxEntitlementsPerBatch,
+                async (info, ct) =>
+                {
+                    var args = new ListEntitlementsParams()
+                    {
+                        Limit = info.PageSize,
+                        BeforeId = beforeId ?? Optional<ulong>.Unspecified,
+                        ExcludeEnded = excludeEnded,
+                        GuildId = guildId ?? Optional<ulong>.Unspecified,
+                        UserId = userId ?? Optional<ulong>.Unspecified,
+                        SkuIds = skuIds ?? Optional<ulong[]>.Unspecified,
+                    };
+                    if (info.Position != null)
+                        args.AfterId = info.Position.Value;
+                    var models = await client.ApiClient.ListEntitlementAsync(args, options).ConfigureAwait(false);
+                    return models
+                        .Select(x => RestEntitlement.Create(client, x))
+                        .ToImmutableArray();
+                },
+                nextPage: (info, lastPage) =>
+                {
+                    if (lastPage.Count != DiscordConfig.MaxEntitlementsPerBatch)
+                        return false;
+                    info.Position = lastPage.Max(x => x.Id);
+                    return true;
+                },
+                start: afterId,
+                count: limit
+            );
+        }
+
+        public static async Task<IReadOnlyCollection<SKU>> ListSKUsAsync(BaseDiscordClient client, RequestOptions options = null)
+        {
+            var models = await client.ApiClient.ListSKUsAsync(options).ConfigureAwait(false);
+
+            return models.Select(x => new SKU(x.Id, x.Type, x.ApplicationId, x.Name, x.Slug)).ToImmutableArray();
+        }
+
         #endregion
     }
 }

src/Discord.Net.Rest/DiscordRestApiClient.cs

@@ -7,6 +7,7 @@ using Discord.Net.Rest;
 using Newtonsoft.Json;
 
 using System;
+using System.Collections;
 using System.Collections.Concurrent;
 using System.Collections.Generic;
 using System.ComponentModel.Design;
@@ -2254,7 +2255,7 @@ namespace Discord.API
             return await SendAsync<GuildOnboarding>("GET", () => $"guilds/{guildId}/onboarding", new BucketIds(guildId: guildId), options: options);
         }
 
-        public async Task<GuildOnboarding> ModifyGuildOnboardingAsync(ulong guildId, ModifyGuildOnboardingParams args,  RequestOptions options)
+        public async Task<GuildOnboarding> ModifyGuildOnboardingAsync(ulong guildId, ModifyGuildOnboardingParams args, RequestOptions options)
         {
             Preconditions.NotEqual(guildId, 0, nameof(guildId));
 
@@ -2689,5 +2690,55 @@ namespace Discord.API
         => await SendJsonAsync<RoleConnection>("PUT", () => $"users/@me/applications/{applicationId}/role-connection", connection, new BucketIds(), options: options);
 
         #endregion
+
+        #region App Monetization
+
+        public async Task<Entitlement> CreateEntitlementAsync(CreateEntitlementParams args, RequestOptions options = null)
+            => await SendJsonAsync<Entitlement>("POST", () => $"applications/{CurrentApplicationId}/entitlements", args, new BucketIds(), options: options).ConfigureAwait(false);
+
+        public async Task DeleteEntitlementAsync(ulong entitlementId, RequestOptions options = null)
+            => await SendAsync("DELETE", () => $"applications/{CurrentApplicationId}/entitlements/{entitlementId}", new BucketIds(), options: options).ConfigureAwait(false);
+
+        public async Task<Entitlement[]> ListEntitlementAsync(ListEntitlementsParams args, RequestOptions options = null)
+        {
+            var query = $"?limit={args.Limit.GetValueOrDefault(100)}";
+
+            if (args.UserId.IsSpecified)
+            {
+                query += $"&user_id={args.UserId.Value}";
+            }
+
+            if (args.SkuIds.IsSpecified)
+            {
+                query += $"&sku_ids={WebUtility.UrlEncode(string.Join(",", args.SkuIds.Value))}";
+            }
+
+            if (args.BeforeId.IsSpecified)
+            {
+                query += $"&before={args.BeforeId.Value}";
+            }
+
+            if (args.AfterId.IsSpecified)
+            {
+                query += $"&after={args.AfterId.Value}";
+            }
+
+            if (args.GuildId.IsSpecified)
+            {
+                query += $"&guild_id={args.GuildId.Value}";
+            }
+
+            if (args.ExcludeEnded.IsSpecified)
+            {
+                query += $"&exclude_ended={args.ExcludeEnded.Value}";
+            }
+
+            return await SendAsync<Entitlement[]>("GET", () => $"applications/{CurrentApplicationId}/entitlements{query}", new BucketIds(), options: options).ConfigureAwait(false);
+        }
+
+        public async Task<SKU[]> ListSKUsAsync(RequestOptions options = null)
+            => await SendAsync<SKU[]>("GET", () => $"applications/{CurrentApplicationId}/skus", new BucketIds(), options: options).ConfigureAwait(false);
+
+        #endregion
     }
 }

src/Discord.Net.Rest/DiscordRestClient.cs

@@ -278,9 +278,30 @@ namespace Discord.Rest
         public Task<RoleConnection> ModifyUserApplicationRoleConnectionAsync(ulong applicationId, RoleConnectionProperties roleConnection, RequestOptions options = null)
             => ClientHelper.ModifyUserRoleConnectionAsync(applicationId, roleConnection, this, options);
 
+        /// <inheritdoc cref="IDiscordClient.CreateTestEntitlementAsync" />
+        public Task<RestEntitlement> CreateTestEntitlementAsync(ulong skuId, ulong ownerId, SubscriptionOwnerType ownerType, RequestOptions options = null)
+            => ClientHelper.CreateTestEntitlementAsync(this, skuId, ownerId, ownerType, options);
+
+        /// <inheritdoc />
+        public Task DeleteTestEntitlementAsync(ulong entitlementId, RequestOptions options = null)
+            => ApiClient.DeleteEntitlementAsync(entitlementId, options);
+
+        /// <inheritdoc cref="IDiscordClient.GetEntitlementsAsync" />
+        public IAsyncEnumerable<IReadOnlyCollection<IEntitlement>> GetEntitlementsAsync(int? limit = 100,
+            ulong? afterId = null, ulong? beforeId = null, bool excludeEnded = false, ulong? guildId = null, ulong? userId = null,
+            ulong[] skuIds = null, RequestOptions options = null)
+            => ClientHelper.ListEntitlementsAsync(this, limit, afterId, beforeId, excludeEnded, guildId, userId, skuIds, options);
+
+        /// <inheritdoc />
+        public Task<IReadOnlyCollection<SKU>> GetSKUsAsync(RequestOptions options = null)
+            => ClientHelper.ListSKUsAsync(this, options);
+
         #endregion
 
         #region IDiscordClient
+        async Task<IEntitlement> IDiscordClient.CreateTestEntitlementAsync(ulong skuId, ulong ownerId, SubscriptionOwnerType ownerType, RequestOptions options)
+            => await CreateTestEntitlementAsync(skuId, ownerId, ownerType, options).ConfigureAwait(false);
+
         /// <inheritdoc />
         async Task<IApplication> IDiscordClient.GetApplicationInfoAsync(RequestOptions options)
             => await GetApplicationInfoAsync(options).ConfigureAwait(false);

src/Discord.Net.Rest/Entities/AppSubscriptions/RestEntitlement.cs

@@ -0,0 +1,66 @@
+using System;
+
+using Model = Discord.API.Entitlement;
+
+namespace Discord.Rest;
+
+public class RestEntitlement : RestEntity<ulong>, IEntitlement
+{
+    /// <inheritdoc/>
+    public DateTimeOffset CreatedAt { get; private set; }
+
+    /// <inheritdoc/>
+    public ulong SkuId { get; private set; }
+
+    /// <inheritdoc/>
+    public ulong? UserId { get; private set; }
+
+    /// <inheritdoc/>
+    public ulong? GuildId { get; private set; }
+
+    /// <inheritdoc/>
+    public ulong ApplicationId { get; private set; }
+
+    /// <inheritdoc/>
+    public EntitlementType Type { get; private set; }
+
+    /// <inheritdoc/>
+    public bool IsConsumed { get; private set; }
+
+    /// <inheritdoc/>
+    public DateTimeOffset? StartsAt { get; private set; }
+
+    /// <inheritdoc/>
+    public DateTimeOffset? EndsAt { get; private set; }
+
+    internal RestEntitlement(BaseDiscordClient discord, ulong id) : base(discord, id)
+    {
+    }
+
+    internal static RestEntitlement Create(BaseDiscordClient discord, Model model)
+    {
+        var entity = new RestEntitlement(discord, model.Id);
+        entity.Update(model);
+        return entity;
+    }
+
+    internal void Update(Model model)
+    {
+        SkuId = model.SkuId;
+        UserId = model.UserId.IsSpecified
+            ? model.UserId.Value
+            : null;
+        GuildId = model.GuildId.IsSpecified
+            ? model.GuildId.Value
+            : null;
+        ApplicationId = model.ApplicationId;
+        Type = model.Type;
+        IsConsumed = model.IsConsumed;
+        StartsAt = model.StartsAt.IsSpecified
+            ? model.StartsAt.Value
+            : null;
+        EndsAt = model.EndsAt.IsSpecified
+            ? model.EndsAt.Value
+            : null;
+    }
+}

src/Discord.Net.Rest/Entities/Interactions/InteractionHelper.cs

@@ -522,6 +522,17 @@ namespace Discord.Rest
 
             return client.ApiClient.CreateInteractionResponseAsync(apiArgs, interactionId, interactionToken, options);
         }
+
+        public static async Task RespondWithPremiumRequiredAsync(BaseDiscordClient client, ulong interactionId,
+            string interactionToken, RequestOptions options = null)
+        {
+            await client.ApiClient.CreateInteractionResponseAsync(new InteractionResponse
+            {
+                Type = InteractionResponseType.PremiumRequired,
+                Data = Optional<InteractionCallbackData>.Unspecified
+            }, interactionId, interactionToken, options);
+        }
+
         #endregion
 
         #region Guild permissions

src/Discord.Net.Rest/Entities/Interactions/RestInteraction.cs

@@ -2,7 +2,9 @@ using Discord.Net;
 using Newtonsoft.Json;
 using System;
 using System.Collections.Generic;
+using System.Collections.Immutable;
 using System.IO;
+using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 using DataModel = Discord.API.ApplicationCommandInteractionData;
@@ -88,6 +90,9 @@ namespace Discord.Rest
         /// <inheritdoc/>
         public ulong ApplicationId { get; private set; }
 
+        /// <inheritdoc cref="IDiscordInteraction.Entitlements" />
+        public IReadOnlyCollection<RestEntitlement> Entitlements { get; private set; }
+
         internal RestInteraction(BaseDiscordClient discord, ulong id)
             : base(discord, id)
         {
@@ -223,6 +228,8 @@ namespace Discord.Rest
             GuildLocale = model.GuildLocale.IsSpecified
                 ? model.GuildLocale.Value
                 : null;
+
+            Entitlements = model.Entitlements.Select(x => RestEntitlement.Create(discord, x)).ToImmutableArray();
         }
 
         internal string SerializePayload(object payload)
@@ -413,7 +420,14 @@ namespace Discord.Rest
         public Task DeleteOriginalResponseAsync(RequestOptions options = null)
             => InteractionHelper.DeleteInteractionResponseAsync(Discord, this, options);
 
+        /// <inheritdoc/>
+        public Task RespondWithPremiumRequiredAsync(RequestOptions options = null)
+            => InteractionHelper.RespondWithPremiumRequiredAsync(Discord, Id, Token, options);
+
         #region  IDiscordInteraction
+        /// <inheritdoc/>
+        IReadOnlyCollection<IEntitlement> IDiscordInteraction.Entitlements => Entitlements;
+
         /// <inheritdoc/>
         IUser IDiscordInteraction.User => User;
 

src/Discord.Net.WebSocket/BaseSocketClient.Events.cs

@@ -1,4 +1,5 @@
 using Discord.Rest;
+
 using System;
 using System.Collections.Generic;
 using System.Threading.Tasks;
@@ -918,7 +919,7 @@ namespace Discord.WebSocket
             add => _autoModRuleCreated.Add(value);
             remove => _autoModRuleCreated.Remove(value);
         }
-        internal readonly AsyncEvent<Func<SocketAutoModRule, Task>> _autoModRuleCreated = new ();
+        internal readonly AsyncEvent<Func<SocketAutoModRule, Task>> _autoModRuleCreated = new();
 
         /// <summary>
         ///     Fired when an auto moderation rule is modified.
@@ -928,7 +929,7 @@ namespace Discord.WebSocket
             add => _autoModRuleUpdated.Add(value);
             remove => _autoModRuleUpdated.Remove(value);
         }
-        internal readonly AsyncEvent<Func<Cacheable<SocketAutoModRule, ulong>, SocketAutoModRule, Task>> _autoModRuleUpdated = new ();
+        internal readonly AsyncEvent<Func<Cacheable<SocketAutoModRule, ulong>, SocketAutoModRule, Task>> _autoModRuleUpdated = new();
 
         /// <summary>
         ///     Fired when an auto moderation rule is deleted.
@@ -938,7 +939,7 @@ namespace Discord.WebSocket
             add => _autoModRuleDeleted.Add(value);
             remove => _autoModRuleDeleted.Remove(value);
         }
-        internal readonly AsyncEvent<Func<SocketAutoModRule, Task>> _autoModRuleDeleted = new ();
+        internal readonly AsyncEvent<Func<SocketAutoModRule, Task>> _autoModRuleDeleted = new();
 
         /// <summary>
         ///     Fired when an auto moderation rule is triggered by a user.
@@ -948,7 +949,47 @@ namespace Discord.WebSocket
             add => _autoModActionExecuted.Add(value);
             remove => _autoModActionExecuted.Remove(value);
         }
-        internal readonly AsyncEvent<Func<SocketGuild, AutoModRuleAction, AutoModActionExecutedData, Task>> _autoModActionExecuted = new ();
+        internal readonly AsyncEvent<Func<SocketGuild, AutoModRuleAction, AutoModActionExecutedData, Task>> _autoModActionExecuted = new();
+
+        #endregion
+
+        #region App Subscriptions
+
+        /// <summary>
+        ///     Fired when a user subscribes to a SKU.
+        /// </summary>
+        public event Func<SocketEntitlement, Task> EntitlementCreated
+        {
+            add { _entitlementCreated.Add(value); }
+            remove { _entitlementCreated.Remove(value); }
+        }
+
+        internal readonly AsyncEvent<Func<SocketEntitlement, Task>> _entitlementCreated = new();
+
+
+        /// <summary>
+        ///     Fired when a subscription to a SKU is updated.
+        /// </summary>
+        public event Func<Cacheable<SocketEntitlement, ulong>, SocketEntitlement, Task> EntitlementUpdated
+        {
+            add { _entitlementUpdated.Add(value); }
+            remove { _entitlementUpdated.Remove(value); }
+        }
+
+        internal readonly AsyncEvent<Func<Cacheable<SocketEntitlement, ulong>, SocketEntitlement, Task>> _entitlementUpdated = new();
+
+
+        /// <summary>
+        ///     Fired when a user's entitlement is deleted.
+        /// </summary>
+        public event Func<Cacheable<SocketEntitlement, ulong>, Task> EntitlementDeleted
+        {
+            add { _entitlementDeleted.Add(value); }
+            remove { _entitlementDeleted.Remove(value); }
+        }
+
+        internal readonly AsyncEvent<Func<Cacheable<SocketEntitlement, ulong>, Task>> _entitlementDeleted = new();
+
 
         #endregion
     }

src/Discord.Net.WebSocket/ClientState.cs

@@ -17,6 +17,7 @@ namespace Discord.WebSocket
         private readonly ConcurrentDictionary<ulong, SocketGlobalUser> _users;
         private readonly ConcurrentHashSet<ulong> _groupChannels;
         private readonly ConcurrentDictionary<ulong, SocketApplicationCommand> _commands;
+        private readonly ConcurrentDictionary<ulong, SocketEntitlement> _entitlements;
 
         internal IReadOnlyCollection<SocketChannel> Channels => _channels.ToReadOnlyCollection();
         internal IReadOnlyCollection<SocketDMChannel> DMChannels => _dmChannels.ToReadOnlyCollection();
@@ -24,6 +25,7 @@ namespace Discord.WebSocket
         internal IReadOnlyCollection<SocketGuild> Guilds => _guilds.ToReadOnlyCollection();
         internal IReadOnlyCollection<SocketGlobalUser> Users => _users.ToReadOnlyCollection();
         internal IReadOnlyCollection<SocketApplicationCommand> Commands => _commands.ToReadOnlyCollection();
+        internal IReadOnlyCollection<SocketEntitlement> Entitlements => _entitlements.ToReadOnlyCollection();
 
         internal IReadOnlyCollection<ISocketPrivateChannel> PrivateChannels =>
             _dmChannels.Select(x => x.Value as ISocketPrivateChannel).Concat(
@@ -40,6 +42,7 @@ namespace Discord.WebSocket
             _users = new ConcurrentDictionary<ulong, SocketGlobalUser>(ConcurrentHashSet.DefaultConcurrencyLevel, (int)(estimatedUsersCount * CollectionMultiplier));
             _groupChannels = new ConcurrentHashSet<ulong>(ConcurrentHashSet.DefaultConcurrencyLevel, (int)(10 * CollectionMultiplier));
             _commands = new ConcurrentDictionary<ulong, SocketApplicationCommand>();
+            _entitlements = new();
         }
 
         internal SocketChannel GetChannel(ulong id)
@@ -170,5 +173,29 @@ namespace Discord.WebSocket
             foreach (var id in ids)
                 _commands.TryRemove(id, out var _);
         }
+
+        internal void AddEntitlement(ulong id, SocketEntitlement entitlement)
+        {
+            _entitlements.TryAdd(id, entitlement);
+        }
+
+        internal SocketEntitlement GetEntitlement(ulong id)
+        {
+            if (_entitlements.TryGetValue(id, out var entitlement))
+                return entitlement;
+            return null;
+        }
+
+        internal SocketEntitlement GetOrAddEntitlement(ulong id, Func<ulong, SocketEntitlement> entitlementFactory)
+        {
+            return _entitlements.GetOrAdd(id, entitlementFactory);
+        }
+
+        internal SocketEntitlement RemoveEntitlement(ulong id)
+        {
+            if(_entitlements.TryRemove(id, out var entitlement))
+                return entitlement;
+            return null;
+        }
     }
 }

src/Discord.Net.WebSocket/DiscordSocketClient.cs

@@ -428,6 +428,35 @@ namespace Discord.WebSocket
         public override SocketUser GetUser(string username, string discriminator = null)
             => State.Users.FirstOrDefault(x => (discriminator is null || x.Discriminator == discriminator) && x.Username == username);
 
+        /// <inheritdoc cref="IDiscordClient.CreateTestEntitlementAsync"/>
+        public Task<RestEntitlement> CreateTestEntitlementAsync(ulong skuId, ulong ownerId, SubscriptionOwnerType ownerType, RequestOptions options = null)
+            => ClientHelper.CreateTestEntitlementAsync(this, skuId, ownerId, ownerType, options);
+
+        /// <inheritdoc />
+        public Task DeleteTestEntitlementAsync(ulong entitlementId, RequestOptions options = null)
+            => ApiClient.DeleteEntitlementAsync(entitlementId, options);
+
+        /// <inheritdoc cref="IDiscordClient.GetEntitlementsAsync"/>
+        public IAsyncEnumerable<IReadOnlyCollection<IEntitlement>> GetEntitlementsAsync(BaseDiscordClient client, int? limit = 100,
+            ulong? afterId = null, ulong? beforeId = null, bool excludeEnded = false, ulong? guildId = null, ulong? userId = null,
+            ulong[] skuIds = null, RequestOptions options = null)
+            => ClientHelper.ListEntitlementsAsync(this, limit, afterId, beforeId, excludeEnded, guildId, userId, skuIds, options);
+
+        /// <inheritdoc />
+        public Task<IReadOnlyCollection<SKU>> GetSKUsAsync(RequestOptions options = null)
+            => ClientHelper.ListSKUsAsync(this, options);
+
+        /// <summary>
+        ///     Gets entitlements from cache.
+        /// </summary>
+        public IReadOnlyCollection<SocketEntitlement> Entitlements => State.Entitlements;
+
+        /// <summary>
+        ///     Gets an entitlement from cache. <see langword="null"/> if not found.
+        /// </summary>
+        public SocketEntitlement GetEntitlement(ulong id)
+            => State.GetEntitlement(id);
+
         /// <summary>
         ///     Gets a global application command.
         /// </summary>
@@ -2903,18 +2932,18 @@ namespace Discord.WebSocket
                             #region Audit Logs
 
                             case "GUILD_AUDIT_LOG_ENTRY_CREATE":
-                            {
+                                {
-                                var data = (payload as JToken).ToObject<AuditLogCreatedEvent>(_serializer);
+                                    var data = (payload as JToken).ToObject<AuditLogCreatedEvent>(_serializer);
-                                type = "GUILD_AUDIT_LOG_ENTRY_CREATE";
+                                    type = "GUILD_AUDIT_LOG_ENTRY_CREATE";
-                                await _gatewayLogger.DebugAsync("Received Dispatch (GUILD_AUDIT_LOG_ENTRY_CREATE)").ConfigureAwait(false);
+                                    await _gatewayLogger.DebugAsync("Received Dispatch (GUILD_AUDIT_LOG_ENTRY_CREATE)").ConfigureAwait(false);
 
-                                var guild = State.GetGuild(data.GuildId);
+                                    var guild = State.GetGuild(data.GuildId);
-                                var auditLog = SocketAuditLogEntry.Create(this, data);
+                                    var auditLog = SocketAuditLogEntry.Create(this, data);
-                                guild.AddAuditLog(auditLog);
+                                    guild.AddAuditLog(auditLog);
 
-                                await TimedInvokeAsync(_auditLogCreated, nameof(AuditLogCreated), auditLog, guild);
+                                    await TimedInvokeAsync(_auditLogCreated, nameof(AuditLogCreated), auditLog, guild);
-                            }
+                                }
-                            break;
+                                break;
                             #endregion
 
                             #region Auto Moderation
@@ -3051,6 +3080,65 @@ namespace Discord.WebSocket
 
                             #endregion
 
+                            #region App Subscriptions
+
+                            case "ENTITLEMENT_CREATE":
+                                {
+                                    await _gatewayLogger.DebugAsync("Received Dispatch (ENTITLEMENT_CREATE)").ConfigureAwait(false);
+                                    var data = (payload as JToken).ToObject<Entitlement>(_serializer);
+
+                                    var entitlement = SocketEntitlement.Create(this, data);
+                                    State.AddEntitlement(data.Id, entitlement);
+
+                                    await TimedInvokeAsync(_entitlementCreated, nameof(EntitlementCreated), entitlement);
+                                }
+                                break;
+
+                            case "ENTITLEMENT_UPDATE":
+                                {
+                                    await _gatewayLogger.DebugAsync("Received Dispatch (ENTITLEMENT_UPDATE)").ConfigureAwait(false);
+                                    var data = (payload as JToken).ToObject<Entitlement>(_serializer);
+
+                                    var entitlement = State.GetEntitlement(data.Id);
+
+                                    var cacheableBefore = new Cacheable<SocketEntitlement, ulong>(entitlement?.Clone(), data.Id,
+                                        entitlement is not null, () => null);
+
+                                    if (entitlement is null)
+                                    {
+                                        entitlement = SocketEntitlement.Create(this, data);
+                                        State.AddEntitlement(data.Id, entitlement);
+                                    }
+                                    else
+                                    {
+                                        entitlement.Update(data);
+                                    }
+
+                                    await TimedInvokeAsync(_entitlementUpdated, nameof(EntitlementUpdated), cacheableBefore, entitlement);
+                                }
+                                break;
+
+                            case "ENTITLEMENT_DELETE":
+                                {
+                                    await _gatewayLogger.DebugAsync("Received Dispatch (ENTITLEMENT_DELETE)").ConfigureAwait(false);
+                                    var data = (payload as JToken).ToObject<Entitlement>(_serializer);
+
+                                    var entitlement = State.RemoveEntitlement(data.Id);
+
+                                    if (entitlement is null)
+                                        entitlement = SocketEntitlement.Create(this, data);
+                                    else
+                                        entitlement.Update(data);
+
+                                    var cacheableEntitlement = new Cacheable<SocketEntitlement, ulong>(entitlement, data.Id,
+                                        entitlement is not null, () => null);
+
+                                    await TimedInvokeAsync(_entitlementDeleted, nameof(EntitlementDeleted), cacheableEntitlement);
+                                }
+                                break;
+
+                            #endregion
+
                             #region Ignored (User only)
                             case "CHANNEL_PINS_ACK":
                                 await _gatewayLogger.DebugAsync("Ignored Dispatch (CHANNEL_PINS_ACK)").ConfigureAwait(false);
@@ -3380,10 +3468,9 @@ namespace Discord.WebSocket
         internal int GetAudioId() => _nextAudioId++;
 
         #region IDiscordClient
-        /// <inheritdoc />
-        async Task<IApplication> IDiscordClient.GetApplicationInfoAsync(RequestOptions options)
-            => await GetApplicationInfoAsync().ConfigureAwait(false);
 
+        async Task<IEntitlement> IDiscordClient.CreateTestEntitlementAsync(ulong skuId, ulong ownerId, SubscriptionOwnerType ownerType, RequestOptions options)
+            => await CreateTestEntitlementAsync(skuId, ownerId, ownerType, options).ConfigureAwait(false);
         /// <inheritdoc />
         async Task<IChannel> IDiscordClient.GetChannelAsync(ulong id, CacheMode mode, RequestOptions options)
             => mode == CacheMode.AllowDownload ? await GetChannelAsync(id, options).ConfigureAwait(false) : GetChannel(id);

src/Discord.Net.WebSocket/Entities/AppSubscriptions/SocketEntitlement.cs

@@ -0,0 +1,91 @@
+using Discord.Rest;
+using System;
+
+using Model = Discord.API.Entitlement;
+
+namespace Discord.WebSocket;
+
+public class SocketEntitlement : SocketEntity<ulong>, IEntitlement
+{
+    /// <inheritdoc/>
+    public DateTimeOffset CreatedAt { get; private set; }
+
+    /// <inheritdoc/>
+    public ulong SkuId { get; private set; }
+
+    /// <inheritdoc cref="IEntitlement.UserId"/>
+    public Cacheable<SocketUser, RestUser, IUser, ulong>? User { get; private set; }
+
+    /// <inheritdoc cref="IEntitlement.GuildId"/>
+    public Cacheable<SocketGuild, RestGuild, IGuild, ulong>? Guild { get; private set; }
+
+    /// <inheritdoc/>
+    public ulong ApplicationId { get; private set; }
+
+    /// <inheritdoc/>
+    public EntitlementType Type { get; private set; }
+
+    /// <inheritdoc/>
+    public bool IsConsumed { get; private set; }
+
+    /// <inheritdoc/>
+    public DateTimeOffset? StartsAt { get; private set; }
+
+    /// <inheritdoc/>
+    public DateTimeOffset? EndsAt { get; private set; }
+
+    internal SocketEntitlement(DiscordSocketClient discord, ulong id) : base(discord, id)
+    {
+    }
+
+    internal static SocketEntitlement Create(DiscordSocketClient discord, Model model)
+    {
+        var entity = new SocketEntitlement(discord, model.Id);
+        entity.Update(model);
+        return entity;
+    }
+
+    internal void Update(Model model)
+    {
+        SkuId = model.SkuId;
+
+        if (model.UserId.IsSpecified)
+        {
+            var user = Discord.GetUser(model.UserId.Value);
+
+            User = new Cacheable<SocketUser, RestUser, IUser, ulong>(user, model.UserId.Value, user is not null, async ()
+                    => await Discord.Rest.GetUserAsync(model.UserId.Value));
+        }
+
+        if (model.GuildId.IsSpecified)
+        {
+            var guild = Discord.GetGuild(model.GuildId.Value);
+
+            Guild = new Cacheable<SocketGuild, RestGuild, IGuild, ulong>(guild, model.GuildId.Value, guild is not null, async ()
+                => await Discord.Rest.GetGuildAsync(model.GuildId.Value));
+        }
+
+        ApplicationId = model.ApplicationId;
+        Type = model.Type;
+        IsConsumed = model.IsConsumed;
+        StartsAt = model.StartsAt.IsSpecified
+            ? model.StartsAt.Value
+            : null;
+        EndsAt = model.EndsAt.IsSpecified
+            ? model.EndsAt.Value
+            : null;
+    }
+
+    internal SocketEntitlement Clone() => MemberwiseClone() as SocketEntitlement;
+
+    #region IEntitlement
+
+    /// <inheritdoc/>
+    ulong? IEntitlement.GuildId => Guild?.Id;
+
+    /// <inheritdoc/>
+    ulong? IEntitlement.UserId => User?.Id;
+
+    #endregion
+
+}

src/Discord.Net.WebSocket/Entities/Interaction/SocketInteraction.cs

@@ -2,7 +2,9 @@ using Discord.Net;
 using Discord.Rest;
 using System;
 using System.Collections.Generic;
+using System.Collections.Immutable;
 using System.IO;
+using System.Linq;
 using System.Threading.Tasks;
 using DataModel = Discord.API.ApplicationCommandInteractionData;
 using Model = Discord.API.Interaction;
@@ -71,6 +73,9 @@ namespace Discord.WebSocket
         /// <inheritdoc/>
         public ulong ApplicationId { get; private set; }
 
+        /// <inheritdoc cref="IDiscordInteraction.Entitlements" />
+        public IReadOnlyCollection<RestEntitlement> Entitlements { get; private set; }
+
         internal SocketInteraction(DiscordSocketClient client, ulong id, ISocketMessageChannel channel, SocketUser user)
             : base(client, id)
         {
@@ -142,6 +147,8 @@ namespace Discord.WebSocket
             GuildLocale = model.GuildLocale.IsSpecified
                 ? model.GuildLocale.Value
                 : null;
+
+            Entitlements = model.Entitlements.Select(x => RestEntitlement.Create(Discord, x)).ToImmutableArray();
         }
 
         /// <summary>
@@ -398,6 +405,11 @@ namespace Discord.WebSocket
         /// <param name="options">The request options for this <see langword="async"/> request.</param>
         /// <returns>A task that represents the asynchronous operation of responding to the interaction.</returns>
         public abstract Task RespondWithModalAsync(Modal modal, RequestOptions options = null);
+
+        /// <inheritdoc/>
+        public Task RespondWithPremiumRequiredAsync(RequestOptions options = null)
+            => InteractionHelper.RespondWithPremiumRequiredAsync(Discord, Id, Token, options);
+
         #endregion
 
         /// <summary>
@@ -423,6 +435,9 @@ namespace Discord.WebSocket
         }
 
         #region  IDiscordInteraction
+        /// <inheritdoc/>
+        IReadOnlyCollection<IEntitlement> IDiscordInteraction.Entitlements => Entitlements;
+
         /// <inheritdoc/>
         IUser IDiscordInteraction.User => User;