diff --git a/src/OAuth2/Grant/AuthCode.php b/src/OAuth2/Grant/AuthCode.php
new file mode 100644
index 00000000..05701013
--- /dev/null
+++ b/src/OAuth2/Grant/AuthCode.php
@@ -0,0 +1,130 @@
+<?php
+
+namespace OAuth2;
+
+use OAuth2\Exception;
+
+class AuthCode implements GrantTypeInterface {
+
+    protected $identifier = 'AuthCode';
+    protected $responseType = 'code';
+
+    public function getIdentifier()
+    {
+        return $this->identifier;
+    }
+
+    public function getResponseType()
+    {
+        return $this->responseType;
+    }
+
+    public function completeFlow()
+    {
+        /*
+        // Client ID
+        if ( ! isset($authParams['client_id']) && ! isset($_POST['client_id'])) {
+            throw new ClientException(sprintf($this->errors['invalid_request'], 'client_id'), 0);
+        }
+
+        $params['client_id'] = (isset($authParams['client_id'])) ?
+                                    $authParams['client_id'] :
+                                    $_POST['client_id'];
+
+        // Client secret
+        if ( ! isset($authParams['client_secret']) && ! isset($_POST['client_secret'])) {
+            throw new ClientException(sprintf($this->errors['invalid_request'], 'client_secret'), 0);
+        }
+
+        $params['client_secret'] = (isset($authParams['client_secret'])) ?
+                                        $authParams['client_secret'] :
+                                        $_POST['client_secret'];
+
+        // Redirect URI
+        if ( ! isset($authParams['redirect_uri']) && ! isset($_POST['redirect_uri'])) {
+            throw new ClientException(sprintf($this->errors['invalid_request'], 'redirect_uri'), 0);
+        }
+
+        $params['redirect_uri'] = (isset($authParams['redirect_uri'])) ?
+                                        $authParams['redirect_uri'] :
+                                        $_POST['redirect_uri'];
+
+        // Validate client ID and redirect URI
+        $clientDetails = $this->_dbCall(
+            'validateClient',
+            $params['client_id'],
+            $params['client_secret'],
+            $params['redirect_uri']
+        );
+
+        if ($clientDetails === false) {
+            throw new ClientException($this->errors['invalid_client'], 8);
+        }
+
+        // The authorization code
+        if ( ! isset($authParams['code']) && ! isset($_POST['code'])) {
+            throw new ClientException(sprintf($this->errors['invalid_request'], 'code'), 0);
+        }
+
+        $params['code'] = (isset($authParams['code'])) ?
+                                    $authParams['code'] :
+                                    $_POST['code'];
+
+        // Verify the authorization code matches the client_id and the request_uri
+        $session = $this->_dbCall(
+            'validateAuthCode',
+            $params['client_id'],
+            $params['redirect_uri'],
+            $params['code']
+        );
+
+        if ( ! $session) {
+            throw new ClientException(sprintf($this->errors['invalid_grant'], 'code'), 9);
+        }
+
+        // A session ID was returned so update it with an access token,
+        //  remove the authorisation code, change the stage to 'granted'
+
+        $accessToken = $this->_generateCode();
+        $refreshToken = ($this->_grantTypes['refresh_token']) ?
+                            $this->_generateCode() :
+                            null;
+
+        $accessTokenExpires = time() + $this->_config['access_token_ttl'];
+        $accessTokenExpiresIn = $this->_config['access_token_ttl'];
+
+        $this->_dbCall(
+            'updateSession',
+            $session['id'],
+            null,
+            $accessToken,
+            $refreshToken,
+            $accessTokenExpires,
+            'granted'
+        );
+
+        // Update the session's scopes to reference the access token
+        $this->_dbCall(
+            'updateSessionScopeAccessToken',
+            $session['id'],
+            $accessToken,
+            $refreshToken
+        );
+
+        $response = array(
+            'access_token'  =>  $accessToken,
+            'token_type'    =>  'bearer',
+            'expires'       =>  $accessTokenExpires,
+            'expires_in'    =>  $accessTokenExpiresIn
+        );
+
+        if ($this->_grantTypes['refresh_token']) {
+            $response['refresh_token'] = $refreshToken;
+        }
+
+        return $response;
+
+        */
+    }
+
+}
\ No newline at end of file