diff --git a/README.md b/README.md
index 2981aab..9698f68 100644
--- a/README.md
+++ b/README.md
@@ -10,4 +10,8 @@ Simple [Shopify API](http://api.shopify.com/) client in PHP
 
 ## Usage and Quickstart Skeleton Project
 
-See [phpish/shopify_app-skeleton](https://github.com/phpish/shopify_app-skeleton) and [phpish/shopify_private_app-skeleton](https://github.com/phpish/shopify_private_app-skeleton)
\ No newline at end of file
+See [phpish/shopify_app-skeleton](https://github.com/phpish/shopify_app-skeleton) and [phpish/shopify_private_app-skeleton](https://github.com/phpish/shopify_private_app-skeleton)
+
+## FIXED
+
+I had to fix it so it works with the latest HMAC protocols. Unable to reach creator for pull request.
diff --git a/shopify.php b/shopify.php
index 76ac4d4..cdf4985 100644
--- a/shopify.php
+++ b/shopify.php
@@ -1,41 +1,29 @@
 <?php
-
 	namespace phpish\shopify;
 	use phpish\http;
-
-
 	function install_url($shop, $api_key)
 	{
 		return "http://$shop/admin/api/auth?api_key=$api_key";
 	}
 
-
-	function is_valid_request($query_params, $shared_secret)
-	{
-		if (!isset($query_params['timestamp'])) return false;
-
-		$seconds_in_a_day = 24 * 60 * 60;
-		$older_than_a_day = $query_params['timestamp'] < (time() - $seconds_in_a_day);
-		if ($older_than_a_day) return false;
-
-		$signature = $query_params['signature'];
-		unset($query_params['signature']);
-
-		foreach ($query_params as $key=>$val) $params[] = "$key=$val";
-		sort($params);
-
-		return (md5($shared_secret.implode('', $params)) === $signature);
+	function is_valid_request($query_params, $shared_secret) {
+		if(!is_array($query_params)) return false;
+		if(array_key_exists('shop',$query_params) && array_key_exists('timestamp',$query_params) && array_key_exists('hmac',$query_params)) {
+			$hmac = $query_params['hmac'];
+			unset($query_params['signature']);
+			unset($query_params['hmac']);
+			ksort($query_params);
+			return $hmac == hash_hmac('sha256', http_build_query($query_params), $shared_secret);
+		}
+		return false;
 	}
 
-
 	function authorization_url($shop, $api_key, $scopes=array(), $redirect_uri='')
 	{
 		$scopes = empty($scopes) ? '' : '&scope='.implode(',', $scopes);
 		$redirect_uri = empty($redirect_uri) ? '' : '&redirect_uri='.urlencode($redirect_uri);
 		return "https://$shop/admin/oauth/authorize?client_id=$api_key$scopes$redirect_uri";
 	}
-
-
 	function access_token($shop, $api_key, $shared_secret, $code)
 	{
 		try
@@ -44,27 +32,35 @@ function access_token($shop, $api_key, $shared_secret, $code)
 		}
 		catch (http\CurlException $e) { throw new CurlException($e->getMessage(), $e->getCode(), $e->getRequest()); }
 		catch (http\ResponseException $e) { throw new ApiException($e->getMessage(), $e->getCode(), $e->getRequest(), $e->getResponse()); }
-
 		return $response['access_token'];
 	}
-
-
 	function client($shop, $api_key, $oauth_token, $private_app=false)
 	{
 		$base_uri = $private_app ? _private_app_base_url($shop, $api_key, $oauth_token) : "https://$shop/";
-
 		return function ($method_uri, $query='', $payload='', &$response_headers=array(), $request_headers=array(), $curl_opts=array()) use ($base_uri, $oauth_token, $private_app)
 		{
 			if (!$private_app) $request_headers['X-Shopify-Access-Token'] = $oauth_token;
 			$request_headers['content-type'] = 'application/json; charset=utf-8';
-			$http_client = http\client($base_uri, $request_headers);
-
+			$http_client = http\client($base_uri, $request_headers, array(
+				CURLOPT_HEADER => true,
+				CURLOPT_RETURNTRANSFER => true,
+				# http://www.php.net/manual/en/function.curl-setopt.php#71313
+				# CURLOPT_FOLLOWLOCATION => true,
+				CURLOPT_MAXREDIRS => 3,
+				CURLOPT_SSL_VERIFYPEER => true,
+				CURLOPT_SSL_VERIFYHOST => 2,
+				CURLOPT_USERAGENT => 'phpish/http',
+				CURLOPT_CONNECTTIMEOUT => 25,
+				CURLOPT_TIMEOUT => 25,
+				CURLOPT_SSLVERSION => 1
+			));
 			try
 			{
 				$response = $http_client($method_uri, $query, $payload, $response_headers, $request_headers, $curl_opts);
 			}
 			catch (http\CurlException $e) { throw new CurlException($e->getMessage(), $e->getCode(), $e->getRequest()); }
 			catch (http\ResponseException $e) { throw new ApiException($e->getMessage(), $e->getCode(), $e->getRequest(), $e->getResponse()); }
+			catch (http\Exception $e) { throw new Exception($e->getMessage(), $e->getCode(), $e->getRequest()); }
 			if (isset($response['errors']))
 			{
 				list($method, $uri) = explode(' ', $method_uri, 2);
@@ -74,43 +70,30 @@ function client($shop, $api_key, $oauth_token, $private_app=false)
 				$response = array('headers'=>$response_headers, 'body'=>$response);
 				throw new ApiException($response_headers['http_status_message'].": $uri", $response_headers['http_status_code'], $request, $response);
 			}
-
 			return (is_array($response) and !empty($response)) ? array_shift($response) : $response;
-
 		};
 	}
-
-		function _private_app_base_url($shop, $api_key, $password)
-		{
-			return "https://$api_key:$password@$shop/";
-		}
-
-
+	function _private_app_base_url($shop, $api_key, $password)
+	{
+		return "https://$api_key:$password@$shop/";
+	}
 	function calls_made($response_headers)
 	{
 		return _shop_api_call_limit_param(0, $response_headers);
 	}
-
-
 	function call_limit($response_headers)
 	{
 		return _shop_api_call_limit_param(1, $response_headers);
 	}
-
-
-	function calls_left($response_headers)
+    	function calls_left($response_headers)
 	{
 		return call_limit($response_headers) - calls_made($response_headers);
 	}
-
-
-		function _shop_api_call_limit_param($index, $response_headers)
-		{
-			$params = explode('/', $response_headers['http_x_shopify_shop_api_call_limit']);
-			return (int) $params[$index];
-		}
-
-
+	function _shop_api_call_limit_param($index, $response_headers)
+	{
+		$params = explode('/', $response_headers['http_x_shopify_shop_api_call_limit']);
+		return (int) $params[$index];
+	}
 	class Exception extends http\Exception { }
 	class CurlException extends Exception { }
 	class ApiException extends Exception
@@ -124,5 +107,4 @@ function __construct($message, $code, $request, $response=array(), Exception $pr
 			parent::__construct($this->message, $code, $request, $response, $previous);
 		}
 	}
-
-?>
\ No newline at end of file
+?>