diff --git a/main/mashape/authentication/Authentication.php b/main/mashape/authentication/Authentication.php
index 91979bb..5a3bc14 100644
--- a/main/mashape/authentication/Authentication.php
+++ b/main/mashape/authentication/Authentication.php
@@ -1,6 +1,6 @@
 <?php
 interface Authentication {
-	public function handleHeader();
+	public function handleHeaders();
 
 	public function handleParams();
 }
diff --git a/main/mashape/authentication/BasicAuthentication.php b/main/mashape/authentication/BasicAuthentication.php
index a7555b1..5c50be5 100644
--- a/main/mashape/authentication/BasicAuthentication.php
+++ b/main/mashape/authentication/BasicAuthentication.php
@@ -3,15 +3,15 @@ require_once(dirname(__FILE__) . "/HeaderAuthentication.php");
 
 class BasicAuthentication extends HeaderAuthentication {
 
-	private $header;
+	private $headers;
 
 	function __construct($username, $password) {
 		$headerValue = $username . ":" . $password;
-		$this->header = "Authorization: Basic " . base64_encode($headerValue);
+		$this->headers = array("Authorization: Basic " . base64_encode($headerValue));
 	}
 
-	public function handleHeader() {
-		return $this->header;
+	public function handleHeaders() {
+		return $this->headers;
 	}
 
 	public function handleParams() {
diff --git a/main/mashape/authentication/CustomHeaderAuthentication.php b/main/mashape/authentication/CustomHeaderAuthentication.php
index 28c93f6..c1e1345 100644
--- a/main/mashape/authentication/CustomHeaderAuthentication.php
+++ b/main/mashape/authentication/CustomHeaderAuthentication.php
@@ -3,14 +3,14 @@ require_once(dirname(__FILE__) . "/HeaderAuthentication.php");
 
 class CustomHeaderAuthentication extends HeaderAuthentication {
 
-	private $header;
+	private $headers;
 
 	function __construct($headerName, $headerValue) {
-		$this->header = $headerName . ": " . $headerValue;
+		$this->headers = array($headerName . ": " . $headerValue);
 	}
 
-	public function handleHeader() {
-		return $this->header;
+	public function handleHeaders() {
+		return $this->headers;
 	}
 
 	public function handleParams() {
diff --git a/main/mashape/authentication/MashapeAuthentication.php b/main/mashape/authentication/MashapeAuthentication.php
index f568e41..82d0582 100644
--- a/main/mashape/authentication/MashapeAuthentication.php
+++ b/main/mashape/authentication/MashapeAuthentication.php
@@ -4,14 +4,14 @@ require_once(dirname(__FILE__) . "/HeaderAuthentication.php");
 
 class MashapeAuthentication extends HeaderAuthentication {
 
-	private $header;
+	private $headers;
 
 	function __construct($publicKey, $privateKey) {
-		$this->header = AuthenticationUtil::generateAuthenticationHeader($publicKey, $privateKey);
+		$this->headers = array(AuthenticationUtil::generateAuthenticationHeader($publicKey, $privateKey));
 	}
 
-	public function handleHeader() {
-		return $this->header;
+	public function handleHeaders() {
+		return $this->headers;
 	}
 }
 ?>
diff --git a/main/mashape/authentication/OAuth10aAuthentication.php b/main/mashape/authentication/OAuth10aAuthentication.php
new file mode 100644
index 0000000..04f8d34
--- /dev/null
+++ b/main/mashape/authentication/OAuth10aAuthentication.php
@@ -0,0 +1,27 @@
+<?php
+require_once(dirname(__FILE__) . "/OAuthAuthentication.php");
+
+class OAuth10aAuthentication extends OAuthAuthentication {
+
+	function __construct($consumerKey, $consumerSecret, $redirectUrl) {
+		parent::__construct($consumerKey, $consumerSecret, $redirectUrl);
+	}
+
+	public function handleHeaders() {
+		if (!isset($this->accessToken) || !isset($this->accessSecret)) {
+			throw new MashapeClientException(
+				EXCEPTION_OAUTH1_AUTHORIZE, 
+				EXCEPTION_OAUTH1_AUTHORIZE_CODE);
+		}
+		$headers = array();
+		$headers[] = "x-mashape-oauth-consumerkey: " . $this->consumerKey;
+		$headers[] = "x-mashape-oauth-consumersecret: " . $this->consumerSecret;
+		$headers[] = "x-mashape-oauth-accesstoken: " . $this->accessToken;
+		$headers[] = "x-mashape-oauth-accesssecret: " . $this->accessSecret;
+		return $headers;
+	}
+}
+?>
+
+
+
diff --git a/main/mashape/authentication/OAuth2Authentication.php b/main/mashape/authentication/OAuth2Authentication.php
new file mode 100644
index 0000000..60f9b12
--- /dev/null
+++ b/main/mashape/authentication/OAuth2Authentication.php
@@ -0,0 +1,24 @@
+<?php
+require_once(dirname(__FILE__) . "/OAuthAuthentication.php");
+
+class OAuth2Authentication extends OAuthAuthentication {
+
+	function __construct($consumerKey, $consumerSecret, $redirectUrl) {
+		parent::__construct($consumerKey, $consumerSecret, $redirectUrl);
+	}
+
+	public function handleParams() {
+		if ($this->accessToken == null) {
+			throw new MashapeClientException(
+				EXCEPTION_OAUTH2_AUTHORIZE, 
+				EXCEPTION_OAUTH2_AUTHORIZE_CODE);
+		}
+		$params = array("accesstoken" => $this->accessToken);
+		return $params;
+	}
+}
+?>
+
+
+
+
diff --git a/main/mashape/authentication/OAuthAuthentication.php b/main/mashape/authentication/OAuthAuthentication.php
new file mode 100644
index 0000000..c4af9dd
--- /dev/null
+++ b/main/mashape/authentication/OAuthAuthentication.php
@@ -0,0 +1,42 @@
+<?php
+require_once(dirname(__FILE__) . "/Authentication.php");
+
+class OAuthAuthentication implements Authentication {
+
+	protected $consumerKey;
+	protected $consumerSecret;
+	protected $redirectUrl;
+	protected $accessToken;
+	protected $accessSecret;
+
+	function __construct($consumerKey, $consumerSecret, $redirectUrl) {
+		$this->consumerKey = $consumerKey;
+		$this->consumerSecret = $consumerSecret;
+		$this->redirectUrl = $redirectUrl;
+	}
+
+	public function addAccessToken($accessToken, $accessSecret = null) {
+		$this->accessToken = $accessToken;
+		$this->accessSecret = $accessSecret;
+	}
+
+    public function getOAuthBaseParams() {
+		$params = array(
+			"consumerKey" => $this->consumerKey,
+			"consumerSecret" => $this->consumerSecret,
+			"redirectUrl" => $this->redirectUrl,
+		);
+        return $params;
+    }
+
+	public function handleParams() {
+		return null;
+	}
+
+	public function handleHeaders() {
+		return null;
+	}
+}
+?>
+
+
diff --git a/main/mashape/authentication/QueryAuthentication.php b/main/mashape/authentication/QueryAuthentication.php
index 3fe9c06..3693219 100644
--- a/main/mashape/authentication/QueryAuthentication.php
+++ b/main/mashape/authentication/QueryAuthentication.php
@@ -9,7 +9,7 @@ class QueryAuthentication implements Authentication {
 		$this->params = array($queryKey => $queryValue);
 	}
 
-	public function handleHeader() {
+	public function handleHeaders() {
 		return null;
 	}
 
diff --git a/main/mashape/exceptions/ExceptionConstants.php b/main/mashape/exceptions/ExceptionConstants.php
index 783800b..0b84ce2 100755
--- a/main/mashape/exceptions/ExceptionConstants.php
+++ b/main/mashape/exceptions/ExceptionConstants.php
@@ -41,6 +41,16 @@ define("EXCEPTION_CONTENT_TYPE_JSON_QUERYAUTH_CODE", 1006);
 define("EXCEPTION_CONTENT_TYPE_JSON_QUERYAUTH", 
 	"Query Authentication cannot be used in conjunction with content type JSON");
 
+define("EXCEPTION_OAUTH1_AUTHORIZE_CODE", 1007);
+define("EXCEPTION_OAUTH1_AUTHORIZE", 
+	"Before consuming an OAuth endpoint, you must invoke the authorize("
+		."'access_token', 'access_secret') function with non-null values");
+
+define("EXCEPTION_OAUTH2_AUTHORIZE_CODE", 1007);
+define("EXCEPTION_OAUTH2_AUTHORIZE", 
+	"Before consuming an OAuth endpoint, you must invoke the authorize("
+		."'access_token') function with a non-null value");
+
 define("EXCEPTION_NOTSUPPORTED_CONTENTTYPE_CODE", 415);
 define("EXCEPTION_NOTSUPPORTED_CONTENTTYPE", 
 	"Content Type not supported. Currently only application/x-www-form-urlencoded, "
diff --git a/main/mashape/http/HttpClient.php b/main/mashape/http/HttpClient.php
index 1527e84..0209684 100755
--- a/main/mashape/http/HttpClient.php
+++ b/main/mashape/http/HttpClient.php
@@ -35,6 +35,8 @@ require_once(dirname(__FILE__) . "/../authentication/BasicAuthentication.php");
 require_once(dirname(__FILE__) . "/../authentication/CustomHeaderAuthentication.php");
 require_once(dirname(__FILE__) . "/../authentication/MashapeAuthentication.php");
 require_once(dirname(__FILE__) . "/../authentication/QueryAuthentication.php");
+require_once(dirname(__FILE__) . "/../authentication/Oauth10aAuthentication.php");
+require_once(dirname(__FILE__) . "/../authentication/Oauth2Authentication.php");
 
 class HttpClient {
 
diff --git a/main/mashape/http/HttpUtils.php b/main/mashape/http/HttpUtils.php
index 00ff336..ada4849 100644
--- a/main/mashape/http/HttpUtils.php
+++ b/main/mashape/http/HttpUtils.php
@@ -58,7 +58,7 @@ class HttpUtils {
 			break;
 		default:
 			throw new MashapeClientException(
-				EXCEPTION_NOTSUPPORTED_CONTENTTYPE, 
+				EXCEPTION_NOTSUPPORTED_CONTENTTYPE,
 				EXCEPTION_NOTSUPPORTED_CONTENTTYPE_CODE);
 		}
 		return $data;
@@ -73,7 +73,11 @@ class HttpUtils {
 			if ($handler instanceof QueryAuthentication) {
 				$parameters = array_merge($parameters, $handler->handleParams());
 			} else if ($handler instanceof HeaderAuthentication) {
-				$headers[] = $handler->handleHeader();
+				$headers = array_merge($headers, $handler->handleHeaders());
+			} else if ($handler instanceof Oauth10aAuthentication) {
+				$headers = array_merge($headers, $handler->handleHeaders());
+			} else if ($handler instanceof Oauth2Authentication) {
+				$parameters = array_merge($parameters, $handler->handleParams());
 			}
 		}
 		return array($headers, $parameters);