diff --git a/.gitignore b/.gitignore
index f4bee4f..fadb93d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 /vendor/
 test.php
 /test/
+composer.lock
diff --git a/demo.php b/demo.php
new file mode 100644
index 0000000..7047188
--- /dev/null
+++ b/demo.php
@@ -0,0 +1,95 @@
+<?php
+	// require_once __DIR__ . '/' . '../src/socola/Chatfuel.php';
+	// // Chatfuel::sendText("ádas");
+	// $bot = new Chatfuel();
+
+
+	// print_r($_SERVER);
+	require_once __DIR__ . '/' . 'vendor/autoload.php';
+	use Socola\Chatfuel;
+	## Create bot
+	$bot = new Chatfuel();
+
+	## Send text
+	$text = 'Socola';
+	$texts = [$text, $text, $text, $text];
+	$bot->sendText($text);
+	$bot->sendText($texts);
+
+	## Send image
+	$image = 'http://i.imgur.com/luWlRwV.jpg';
+	$images = [
+		'http://i.imgur.com/luWlRwV.jpg',
+		'http://i.imgur.com/luWlRwV.jpg'
+	];
+	$bot->sendImage($image);
+	$bot->sendImage($images);
+
+	## Send file
+	$file = 'https://01b02091.ngrok.io/test.pdf';
+	$files = array(
+		'https://01b02091.ngrok.io/test.pdf',
+		'https://01b02091.ngrok.io/test.pdf'
+	);
+	$bot->sendFile($file);
+	$bot->sendFile($files);
+
+	## Send audio
+	$audio = 'https://01b02091.ngrok.io/test.mp3';
+	$audios = [
+		'https://01b02091.ngrok.io/test.mp3',
+		'https://01b02091.ngrok.io/test.mp3'
+	];
+	$bot->sendAudio($audio);
+	$bot->sendAudio($audios);
+
+	## Create a button
+	### Create Button To URL
+	$title = "button to url";
+	$url = "http://www.facebook.com";
+	$buttonToURL = $bot->createButtonToURL($title, $url, Null);
+
+	### Create Button To Block
+	$title = "button to block";
+	$block = "re-start";
+	$buttonToBlock = $bot->createButtonToBlock($title, $block, Null);
+
+	### Create Button Share
+	$buttonShare = $bot->createButtonShare();
+
+	### Create Button Call
+	$phoneNumber = '096******5';
+	$buttonCall  = $bot->createButtonCall($phoneNumber, 'Call');
+
+	### Create Button Quick Reply
+	$block = 're-start';
+	$blocks = [
+		'play',
+		'pause'
+	];
+	$bot->createButtonQuickReply($title, $block);
+	$bot->createButtonQuickReply($title, $blocks);
+
+
+	### Send a text card with one or more button (max 3 buttons)
+	$text = 'this is text card';
+	$buttons = [
+		$buttonToURL,
+		$buttonToBlock,
+		$buttonShare
+	];
+	$bot->sendTextCard($text, $buttonToURL);
+	$bot->sendTextCard($text, $buttons);
+
+
+	### Create element
+	$title    = 'this is element';
+	$image    = 'http://i.imgur.com/luWlRwV.jpg';
+	$subTitle = 'this is sub title';
+	$element  = $bot->createElement($title, $image, $subTitle, $buttonToURL);
+	$elements = [$element, $element];
+	$bot->sendGallery($element);
+	### Send a list template min 2 element
+	$topElementStyle = 'large';
+	$bot->sendList($elements, $topElementStyle);
+?>
diff --git a/src/socola/Chatfuel.php b/src/socola/Chatfuel.php
index 22689ef..d4dfd2c 100644
--- a/src/socola/Chatfuel.php
+++ b/src/socola/Chatfuel.php
@@ -2,33 +2,32 @@
 	/**
 	 * http://docs.chatfuel.com/plugins/plugin-documentation/json-api
 	 */
-	// interface ChatfuelInterface{
-	// 	public function sendText($text_or_arrayTexts);
-	// 	public function sendImage($image_or_arrayImages);
-	// 	public function sendFile($file_or_arrayFiles);
-	// 	public function sendVideo($url_or_arrayUrls);
-	// 	public function sendAudio($audio_or_arrayAudios);
-
-	// 	public function createButtonToURL($title, $url, $setAttributes = NULL);
-	// 	public function createButtonToBlock($title, $block_or_arrayBlocks, $setAttributes = NULL);
-	// 	public function createButtonShare();
-	// 	public function createButtonCall($phoneNumber, $title = 'Call');
-	// 	public function createButtonQuickReply($title, $block_or_arrayBlocks);
-
-	// 	public function sendTextCard($text, $buttons_or_arrayButtons);
-	// 	public function createElement($title, $image, $subTitle, $buttons);
-	// 	public function sendGallery($element_or_arrayElement);
-	// 	public function sendList($arrayElements, $topElementStyle = 'large');
-	// 	public function isURL($url);
-	// }
 	namespace Socola;
-	class Chatfuel/* implements ChatfuelInterface*/
+	interface ChatfuelInterface{
+		public function sendText($text_or_arrayTexts);
+		public function sendImage($image_or_arrayImages);
+		public function sendFile($file_or_arrayFiles);
+		public function sendVideo($url_or_arrayUrls);
+		public function sendAudio($audio_or_arrayAudios);
+
+		public function createButtonToURL($title, $url, $setAttributes = NULL);
+		public function createButtonToBlock($title, $block_or_arrayBlocks, $setAttributes = NULL);
+		public function createButtonShare();
+		public function createButtonCall($phoneNumber, $title = 'Call');
+		public function createButtonQuickReply($title, $block_or_arrayBlocks);
+
+		public function sendTextCard($text, $buttons_or_arrayButtons);
+		public function createElement($title, $image, $subTitle, $buttons);
+		public function sendGallery($element_or_arrayElement);
+		public function sendList($arrayElements, $topElementStyle = 'large');
+		public function isURL($url);
+	}
+	class Chatfuel implements ChatfuelInterface
 	{
-		private $debug;
-		public $messages;
-		public function __construct($debug = false)
+		protected $debug;
+		protected $messages;
+		function __construct($debug = false)
 		{
-			// header('Content-Type: application/json; charset=UTF-8');
 			$this->debug = $debug;
 		}
 
@@ -50,27 +49,27 @@ public function sendText($messages = null){
 
 		public function sendImage($url)
 		{
-			$this->sendMedia('image', $url);
+			self::sendMedia('image', $url);
 		}
 
 		public function sendFile($url)
 		{
-			$this->sendMedia('file', $url);
+			self::sendMedia('file', $url);
 		}
 
 		public function sendVideo($url)
 		{
-			$this->sendMedia('video', $url);
+			self::sendMedia('video', $url);
 		}
 
 		public function sendAudio($url)
 		{
-			$this->sendMedia('audio', $url);
+			self::sendMedia('audio', $url);
 		}
 
 		public function createButtonToURL($title, $url, $setAttributes = NULL)
 		{
-			if ($this->isURL($url)) {
+			if (self::isURL($url)) {
 				return null;
 			}
 
@@ -146,7 +145,7 @@ public function sendTextCard($text, $buttons)
 			if(empty($buttons[0]['title']))
 				$buttons = [$buttons];
 
-			$this->sendAttachment('template', [
+			self::sendAttachment('template', [
 				'template_type' => 'button',
 				'text' => $text,
 				'buttons' => $buttons
@@ -158,7 +157,7 @@ public function createElement($title, $image, $subTitle, $buttons)
 			if(empty($buttons[0]['type']))
 				$buttons = [$buttons];
 
-			if ($this->isURL($image) && is_array($buttons)) {
+			if (self::isURL($image) && is_array($buttons)) {
 				return array(
 					'title' => $title,
 					'image_url' => $image,
@@ -175,7 +174,7 @@ public function sendGallery($elements)
 			if(empty($elements[0]['title']))
 				return FALSE;
 
-			$this->sendAttachment('template', [
+			self::sendAttachment('template', [
 				'template_type' => 'generic',
 				'elements'      => $elements
 			]);
@@ -186,16 +185,16 @@ public function sendList($elements, $topElementStyle = 'large')
 			if(empty($elements[0]['title']))
 				$elements = array($elements);
 
-			$this->sendAttachment('template', [
+			self::sendAttachment('template', [
 				'template_type'     => 'list',
 				'top_element_style' => $topElementStyle,
 				'elements'          => $elements
 			]);
 		}
 
-		public function __destruct()
+		function __destruct()
 		{
-			$this->sentMessages();
+			self::sentMessages();
 		}
 
 		public function isURL($url){
@@ -209,10 +208,10 @@ public function sendMedia($type, $url)
 			}
 
 			foreach ($url as $value) {
-				if ($this->isURL($value)) {
-					$this->sendAttachment($type, ['url' => $value]);
+				if (self::isURL($value)) {
+					self::sendAttachment($type, ['url' => $value]);
 				} else {
-					$this->sendText('Error: Invalid URL!');
+					self::sendText("Error: Invalid {$type} URL!");
 				}
 			}
 		}
@@ -235,19 +234,19 @@ private function sendAttachment($type, $payload){
 					)
 				);
 			} else {
-				$this->sendText('Error: Invalid type!');
+				self::sendText('Error: Invalid type!');
 			}
 		}
 
 		public function sentMessages()
 		{
 			if(is_null($this->messages))
-				$this->sendText(NULL);
-
+				self::sendText(NULL);
+			header('Content-Type: application/json; charset=UTF-8');
 			if($this->debug){
-				echo json_encode($this, JSON_PRETTY_PRINT);
+				echo json_encode(['messages' => $this->messages], JSON_PRETTY_PRINT);
 			}else{
-				echo json_encode($this);
+				echo json_encode(['messages' => $this->messages]);
 			}
 		}