First commit

DiscordAPI/RPC/Commands/CloseCommand.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using DiscordRPC.RPC.Payload;
+using Newtonsoft.Json;
+
+namespace DiscordRPC.RPC.Commands
+{
+	internal class CloseCommand : ICommand
+	{
+		/// <summary>
+		/// The process ID
+		/// </summary>
+		[JsonProperty("pid")]
+		public int PID { get; set; }
+
+		/// <summary>
+		/// The rich presence to be set. Can be null.
+		/// </summary>
+		[JsonProperty("close_reason")]
+		public string value = "Unity 5.5 doesn't handle thread aborts. Can you please close me discord?";
+
+		public IPayload PreparePayload(long nonce)
+		{
+			return new ArgumentPayload()
+			{
+				Command = Command.Dispatch,
+				Nonce = null,
+				Arguments = null
+			};
+		}
+	}
+}

DiscordAPI/RPC/Commands/ICommand.cs

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+using DiscordRPC.RPC.Payload;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace DiscordRPC.RPC.Commands
+{
+    internal interface ICommand
+	{
+		IPayload PreparePayload(long nonce);
+	}
+}

DiscordAPI/RPC/Commands/PresenceCommand.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using DiscordRPC.RPC.Payload;
+using Newtonsoft.Json;
+
+namespace DiscordRPC.RPC.Commands
+{
+	internal class PresenceCommand : ICommand
+	{
+		/// <summary>
+		/// The process ID
+		/// </summary>
+		[JsonProperty("pid")]
+		public int PID { get; set; }
+
+		/// <summary>
+		/// The rich presence to be set. Can be null.
+		/// </summary>
+		[JsonProperty("activity")]
+		public RichPresence Presence { get; set; }
+
+		public IPayload PreparePayload(long nonce)
+		{
+			return new ArgumentPayload(this, nonce)
+			{
+				Command = Command.SetActivity
+			};
+		}
+	}
+}

DiscordAPI/RPC/Commands/RespondCommand.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using DiscordRPC.RPC.Payload;
+using Newtonsoft.Json;
+
+namespace DiscordRPC.RPC.Commands
+{
+    internal class RespondCommand : ICommand
+	{
+		/// <summary>
+		/// The user ID that we are accepting / rejecting
+		/// </summary>
+		[JsonProperty("user_id")]
+		public string UserID { get; set; }
+
+		/// <summary>
+		/// If true, the user will be allowed to connect.
+		/// </summary>
+		[JsonIgnore]
+		public bool Accept { get; set; }
+
+		public IPayload PreparePayload(long nonce)
+		{
+			return new ArgumentPayload(this, nonce)
+			{
+				Command = Accept ? Command.SendActivityJoinInvite : Command.CloseActivityJoinRequest
+			};
+		}
+	}
+}

DiscordAPI/RPC/Commands/SubscribeCommand.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using DiscordRPC.RPC.Payload;
+
+namespace DiscordRPC.RPC.Commands
+{
+	internal class SubscribeCommand : ICommand
+	{
+		public ServerEvent Event { get; set; }
+		public bool IsUnsubscribe { get; set; }
+		
+		public IPayload PreparePayload(long nonce)
+		{
+			return new EventPayload(nonce)
+			{
+				Command = IsUnsubscribe ? Command.Unsubscribe : Command.Subscribe,
+				Event = Event
+			};
+		}
+	}
+}