Sending a Slackbot message from Unity3d: http://diegogiacomelli.com.br/sending-a-slackbot-message-from-unity3d/

BotController.cs

public class BotController : MonoBehaviour
{
	private void Start()
	{
	   Send("Hello world!");
	}
		
	/// <summary>
	/// Sends a message to a Slack channel using the Slackbot API through the chat.postMessage (https://api.slack.com/methods/chat.postMessage)
	/// </summary>
	private void Send(string message)
	{
		Debug.Log("Sending message '{0}'...", message);
		
		var url = "https://slack.com/api/chat.postMessage";
		var data = new WWWForm();
		
		// Create your Slackbot and its API token here: https://my.slack.com/services/new/bot
		data.AddField("token", "YOUR SLACK BOT API TOKEN");
		
		// The Slack channel.
		data.AddField("channel", "general");
		
		// How the Slack bot will be identified in Slack.
		data.AddField("username", "Buildron");
		
		// Your bot icon url image.
		data.AddField("icon_url", "https://raw.githubusercontent.com/skahal/Buildron/master/docs/images/Buildron-logo-128x128.png");
		
		data.AddField("text", message);
	
		var post = new WWW(url, data);
		StartCoroutine(WaitForPost(post));
	}
	
	private IEnumerator WaitForPost(WWW post)
	{
		yield return post;
	
		Debug.Log("Message sent.");
	}
}