Add callback url to the configuration file.

src/Vinkla/Instagram/InstagramServiceProvider.php

@@ -21,13 +21,22 @@ public function register()
 		// Register 'Instagram' instance container to our Instagram object.
 		$this->app->bindShared('Vinkla\Instagram\Contracts\Instagram', function($app)
 		{
-			return new Instagram(
+			if (
+				empty($app['config']['instagram::client_secret']) &&
+				empty($app['config']['instagram::callback_url'])
+			)
+			{
+				return new Instagram($app['config']['instagram::client_id']);
+			}
+
+			return new Instagram([
 				$app['config']['instagram::client_id'],
 				$app['config']['instagram::client_secret'],
-				$app['config']['instagram::callback']
-			);
+				$app['config']['instagram::callback_url']
+			]);
 		});
 	}
+
 	/**
 	 * Bootstrap the application events.
 	 *
@@ -37,6 +46,7 @@ public function boot()
 	{
 		$this->package('vinkla/instagram');
 	}
+
 	/**
 	 * Get the services provided by the provider.
 	 *

src/config/config.php

@@ -8,7 +8,8 @@
 	|--------------------------------------------------------------------------
 	|
 	| Your applications client identifier. Used when generating authentication
-	| tokens and to receive your authorization code. The client identifier
+	| tokens and to receive your authorization code. This must always be set
+	| to fetch data from Instagram.
 	|
 	*/
 
@@ -20,10 +21,23 @@
 	|--------------------------------------------------------------------------
 	|
 	| Your applications client secret. Used when generating authentication
-	| tokens and to receive your authorization code.
+	| tokens and to receive your authorization code. Leave this NULL if you
+	| only are going to fetch public data.
 	|
 	*/
 
-	'client_secret' => ''
+	'client_secret' => null,
+
+	/*
+	|--------------------------------------------------------------------------
+	| Callback URL
+	|--------------------------------------------------------------------------
+	|
+	| Your applications callback url. Used to authorize users and generating
+	| tokens. Leave this NULL if you only are going to fetch public data.
+	|
+	*/
+
+	'callback_url' => null
 
 ];