diff --git a/src/engine/Api/V1/Filter.php b/src/engine/Api/V1/Filter.php
new file mode 100644
index 00000000..d2611b7d
--- /dev/null
+++ b/src/engine/Api/V1/Filter.php
@@ -0,0 +1,18 @@
+<?php 
+
+/* ----------------------------------------------------------------------------
+ * Easy!Appointments - Open Source Web Scheduler
+ *
+ * @package     EasyAppointments
+ * @author      A.Tselegidis <alextselegidis@gmail.com>
+ * @copyright   Copyright (c) 2013 - 2016, Alex Tselegidis
+ * @license     http://opensource.org/licenses/GPL-3.0 - GPLv3
+ * @link        http://easyappointments.org
+ * @since       v1.2.0
+ * ---------------------------------------------------------------------------- */
+
+namespace \EA\Engine\Api\V1; 
+
+class Response {
+    
+}
diff --git a/src/engine/Api/V1/Minimize.php b/src/engine/Api/V1/Minimize.php
new file mode 100644
index 00000000..d2611b7d
--- /dev/null
+++ b/src/engine/Api/V1/Minimize.php
@@ -0,0 +1,18 @@
+<?php 
+
+/* ----------------------------------------------------------------------------
+ * Easy!Appointments - Open Source Web Scheduler
+ *
+ * @package     EasyAppointments
+ * @author      A.Tselegidis <alextselegidis@gmail.com>
+ * @copyright   Copyright (c) 2013 - 2016, Alex Tselegidis
+ * @license     http://opensource.org/licenses/GPL-3.0 - GPLv3
+ * @link        http://easyappointments.org
+ * @since       v1.2.0
+ * ---------------------------------------------------------------------------- */
+
+namespace \EA\Engine\Api\V1; 
+
+class Response {
+    
+}
diff --git a/src/engine/Api/V1/Search.php b/src/engine/Api/V1/Search.php
new file mode 100644
index 00000000..d2611b7d
--- /dev/null
+++ b/src/engine/Api/V1/Search.php
@@ -0,0 +1,18 @@
+<?php 
+
+/* ----------------------------------------------------------------------------
+ * Easy!Appointments - Open Source Web Scheduler
+ *
+ * @package     EasyAppointments
+ * @author      A.Tselegidis <alextselegidis@gmail.com>
+ * @copyright   Copyright (c) 2013 - 2016, Alex Tselegidis
+ * @license     http://opensource.org/licenses/GPL-3.0 - GPLv3
+ * @link        http://easyappointments.org
+ * @since       v1.2.0
+ * ---------------------------------------------------------------------------- */
+
+namespace \EA\Engine\Api\V1; 
+
+class Response {
+    
+}
diff --git a/src/engine/Api/V1/Sort.php b/src/engine/Api/V1/Sort.php
new file mode 100644
index 00000000..d2611b7d
--- /dev/null
+++ b/src/engine/Api/V1/Sort.php
@@ -0,0 +1,18 @@
+<?php 
+
+/* ----------------------------------------------------------------------------
+ * Easy!Appointments - Open Source Web Scheduler
+ *
+ * @package     EasyAppointments
+ * @author      A.Tselegidis <alextselegidis@gmail.com>
+ * @copyright   Copyright (c) 2013 - 2016, Alex Tselegidis
+ * @license     http://opensource.org/licenses/GPL-3.0 - GPLv3
+ * @link        http://easyappointments.org
+ * @since       v1.2.0
+ * ---------------------------------------------------------------------------- */
+
+namespace \EA\Engine\Api\V1; 
+
+class Response {
+    
+}
diff --git a/test/php/engine/Api/V1/FilterTest.php b/test/php/engine/Api/V1/FilterTest.php
new file mode 100644
index 00000000..e69de29b
diff --git a/test/php/engine/Api/V1/MinimizeTest.php b/test/php/engine/Api/V1/MinimizeTest.php
new file mode 100644
index 00000000..7878b5b4
--- /dev/null
+++ b/test/php/engine/Api/V1/MinimizeTest.php
@@ -0,0 +1,20 @@
+<?php 
+
+/* ----------------------------------------------------------------------------
+ * Easy!Appointments - Open Source Web Scheduler
+ *
+ * @package     EasyAppointments
+ * @author      A.Tselegidis <alextselegidis@gmail.com>
+ * @copyright   Copyright (c) 2013 - 2016, Alex Tselegidis
+ * @license     http://opensource.org/licenses/GPL-3.0 - GPLv3
+ * @link        http://easyappointments.org
+ * @since       v1.2.0
+ * ---------------------------------------------------------------------------- */
+ 
+namespace \EA\Engine\Api\V1;
+
+use PHPUnit\Framework\TestCase;
+
+class AuthorizationTest extends \TestCase {
+    
+}
diff --git a/test/php/engine/Api/V1/SearchTest.php b/test/php/engine/Api/V1/SearchTest.php
new file mode 100644
index 00000000..7878b5b4
--- /dev/null
+++ b/test/php/engine/Api/V1/SearchTest.php
@@ -0,0 +1,20 @@
+<?php 
+
+/* ----------------------------------------------------------------------------
+ * Easy!Appointments - Open Source Web Scheduler
+ *
+ * @package     EasyAppointments
+ * @author      A.Tselegidis <alextselegidis@gmail.com>
+ * @copyright   Copyright (c) 2013 - 2016, Alex Tselegidis
+ * @license     http://opensource.org/licenses/GPL-3.0 - GPLv3
+ * @link        http://easyappointments.org
+ * @since       v1.2.0
+ * ---------------------------------------------------------------------------- */
+ 
+namespace \EA\Engine\Api\V1;
+
+use PHPUnit\Framework\TestCase;
+
+class AuthorizationTest extends \TestCase {
+    
+}
diff --git a/test/php/engine/Api/V1/SortTest.php b/test/php/engine/Api/V1/SortTest.php
new file mode 100644
index 00000000..e69de29b