diff --git a/lib/RetailCrm/ApiClient.php b/lib/RetailCrm/ApiClient.php
index 6bdf66d..cb546cd 100644
--- a/lib/RetailCrm/ApiClient.php
+++ b/lib/RetailCrm/ApiClient.php
@@ -1,11 +1,20 @@
 <?php
+
 namespace RetailCrm;
 
 use RetailCrm\Http\Client;
 use RetailCrm\Response\ApiResponse;
 
 /**
- * retailCRM API client class
+ * PHP version 5.3
+ *
+ * API client class
+ *
+ * @category RetailCrm
+ * @package  RetailCrm
+ * @author   RetailCrm <integration@retailcrm.ru>
+ * @license  https://opensource.org/licenses/MIT MIT License
+ * @link     http://www.retailcrm.ru/docs/Developers/ApiVersion3
  */
 class ApiClient
 {
@@ -22,9 +31,9 @@ class ApiClient
     /**
      * Client creating
      *
-     * @param string $url
-     * @param string $apiKey
-     * @param string $siteCode
+     * @param string $url    api url
+     * @param string $apiKey api key
+     * @param string $site   site code
      *
      * @return mixed
      */
@@ -36,9 +45,7 @@ class ApiClient
 
         $url = $url . 'api/' . self::VERSION;
 
-        $this->client = new Client($url, array(
-            'apiKey' => $apiKey
-        ));
+        $this->client = new Client($url, array('apiKey' => $apiKey));
         $this->siteCode = $site;
     }
 
@@ -46,8 +53,8 @@ class ApiClient
      * Returns filtered orders list
      *
      * @param array $filter (default: array())
-     * @param int $page (default: null)
-     * @param int $limit (default: null)
+     * @param int   $page   (default: null)
+     * @param int   $limit  (default: null)
      *
      * @return ApiResponse
      */
@@ -65,59 +72,77 @@ class ApiClient
             $parameters['limit'] = (int) $limit;
         }
 
-        return $this->client->makeRequest('/orders', Client::METHOD_GET, $parameters);
+        return $this->client->makeRequest(
+            '/orders',
+            Client::METHOD_GET,
+            $parameters
+        );
     }
 
     /**
      * Create a order
      *
-     * @param array $order
-     * @param string $site (default: null)
+     * @param array  $order order data
+     * @param string $site  (default: null)
      *
      * @return ApiResponse
      */
     public function ordersCreate(array $order, $site = null)
     {
         if (! sizeof($order)) {
-            throw new \InvalidArgumentException('Parameter `order` must contains a data');
+            throw new \InvalidArgumentException(
+                'Parameter `order` must contains a data'
+            );
         }
 
-        return $this->client->makeRequest("/orders/create", Client::METHOD_POST, $this->fillSite($site, array(
-            'order' => json_encode($order)
-        )));
+        return $this->client->makeRequest(
+            "/orders/create",
+            Client::METHOD_POST,
+            $this->fillSite($site, array('order' => json_encode($order)))
+        );
     }
 
     /**
      * Save order IDs' (id and externalId) association in the CRM
      *
-     * @param array $ids
+     * @param array $ids order identificators
      *
      * @return ApiResponse
      */
     public function ordersFixExternalIds(array $ids)
     {
         if (! sizeof($ids)) {
-            throw new \InvalidArgumentException('Method parameter must contains at least one IDs pair');
+            throw new \InvalidArgumentException(
+                'Method parameter must contains at least one IDs pair'
+            );
         }
 
-        return $this->client->makeRequest("/orders/fix-external-ids", Client::METHOD_POST, array(
-            'orders' => json_encode($ids)
-        ));
+        return $this->client->makeRequest(
+            "/orders/fix-external-ids",
+            Client::METHOD_POST,
+            array('orders' => json_encode($ids)
+            )
+        );
     }
 
     /**
      * Returns a orders history
      *
-     * @param \DateTime $startDate (default: null)
-     * @param \DateTime $endDate (default: null)
-     * @param int $limit (default: 100)
-     * @param int $offset (default: 0)
-     * @param bool $skipMyChanges (default: true)
+     * @param \DateTime $startDate     (default: null)
+     * @param \DateTime $endDate       (default: null)
+     * @param int       $limit         (default: 100)
+     * @param int       $offset        (default: 0)
+     * @param bool      $skipMyChanges (default: true)
      *
      * @return ApiResponse
      */
-    public function ordersHistory(\DateTime $startDate = null, \DateTime $endDate = null, $limit = 100, $offset = 0, $skipMyChanges = true)
-    {
+    public function ordersHistory(
+        \DateTime $startDate = null,
+        \DateTime $endDate = null,
+        $limit = 100,
+        $offset = 0,
+        $skipMyChanges = true
+    ) {
         $parameters = array();
 
         if ($startDate) {
@@ -136,19 +161,25 @@ class ApiClient
             $parameters['skipMyChanges'] = (bool) $skipMyChanges;
         }
 
-        return $this->client->makeRequest('/orders/history', Client::METHOD_GET, $parameters);
+        return $this->client->makeRequest(
+            '/orders/history',
+            Client::METHOD_GET,
+            $parameters
+        );
     }
 
     /**
      * Returns statuses of the orders
      *
-     * @param array $ids (default: array())
+     * @param array $ids         (default: array())
      * @param array $externalIds (default: array())
      *
      * @return ApiResponse
      */
-    public function ordersStatuses(array $ids = array(), array $externalIds = array())
-    {
+    public function ordersStatuses(
+        array $ids = array(),
+        array $externalIds = array()
+    ) {
         $parameters = array();
 
         if (sizeof($ids)) {
@@ -158,33 +189,41 @@ class ApiClient
             $parameters['externalIds'] = $externalIds;
         }
 
-        return $this->client->makeRequest('/orders/statuses', Client::METHOD_GET, $parameters);
+        return $this->client->makeRequest(
+            '/orders/statuses',
+            Client::METHOD_GET,
+            $parameters
+        );
     }
 
     /**
      * Upload array of the orders
      *
-     * @param array $orders
-     * @param string $site (default: null)
+     * @param array  $orders array of orders
+     * @param string $site   (default: null)
      *
      * @return ApiResponse
      */
     public function ordersUpload(array $orders, $site = null)
     {
         if (! sizeof($orders)) {
-            throw new \InvalidArgumentException('Parameter `orders` must contains array of the orders');
+            throw new \InvalidArgumentException(
+                'Parameter `orders` must contains array of the orders'
+            );
         }
 
-        return $this->client->makeRequest("/orders/upload", Client::METHOD_POST, $this->fillSite($site, array(
-            'orders' => json_encode($orders)
-        )));
+        return $this->client->makeRequest(
+            "/orders/upload",
+            Client::METHOD_POST,
+            $this->fillSite($site, array('orders' => json_encode($orders)))
+        );
     }
 
     /**
      * Get order by id or externalId
      *
-     * @param string $id
-     * @param string $by (default: 'externalId')
+     * @param string $id   order identificator
+     * @param string $by   (default: 'externalId')
      * @param string $site (default: null)
      *
      * @return ApiResponse
@@ -193,48 +232,62 @@ class ApiClient
     {
         $this->checkIdParameter($by);
 
-        return $this->client->makeRequest("/orders/$id", Client::METHOD_GET, $this->fillSite($site, array(
-            'by' => $by
-        )));
+        return $this->client->makeRequest(
+            "/orders/$id",
+            Client::METHOD_GET,
+            $this->fillSite($site, array('by' => $by))
+        );
     }
 
     /**
      * Edit a order
      *
-     * @param array $order
-     * @param string $site (default: null)
+     * @param array  $order order data
+     * @param string $by    (default: 'externalId')
+     * @param string $site  (default: null)
      *
      * @return ApiResponse
      */
     public function ordersEdit(array $order, $by = 'externalId', $site = null)
     {
         if (! sizeof($order)) {
-            throw new \InvalidArgumentException('Parameter `order` must contains a data');
+            throw new \InvalidArgumentException(
+                'Parameter `order` must contains a data'
+            );
         }
 
         $this->checkIdParameter($by);
 
         if (! isset($order[$by])) {
-            throw new \InvalidArgumentException(sprintf('Order array must contain the "%s" parameter.', $by));
+            throw new \InvalidArgumentException(
+                sprintf('Order array must contain the "%s" parameter.', $by)
+            );
         }
 
-        return $this->client->makeRequest("/orders/" . $order[$by] . "/edit", Client::METHOD_POST, $this->fillSite($site, array(
-            'order' => json_encode($order),
-            'by' => $by
-        )));
+        return $this->client->makeRequest(
+            "/orders/" . $order[$by] . "/edit",
+            Client::METHOD_POST,
+            $this->fillSite(
+                $site,
+                array('order' => json_encode($order), 'by' => $by)
+            )
+        );
     }
 
     /**
      * Returns filtered customers list
      *
      * @param array $filter (default: array())
-     * @param int $page (default: null)
-     * @param int $limit (default: null)
+     * @param int   $page   (default: null)
+     * @param int   $limit  (default: null)
      *
      * @return ApiResponse
      */
-    public function customersList(array $filter = array(), $page = null, $limit = null)
-    {
+    public function customersList(
+        array $filter = array(),
+        $page = null,
+        $limit = null
+    ) {
         $parameters = array();
 
         if (sizeof($filter)) {
@@ -247,70 +300,86 @@ class ApiClient
             $parameters['limit'] = (int) $limit;
         }
 
-        return $this->client->makeRequest('/customers', Client::METHOD_GET, $parameters);
+        return $this->client->makeRequest(
+            '/customers',
+            Client::METHOD_GET,
+            $parameters
+        );
     }
 
     /**
      * Create a customer
      *
-     * @param array $customer
-     * @param string $site (default: null)
+     * @param array  $customer customer data
+     * @param string $site     (default: null)
      *
      * @return ApiResponse
      */
     public function customersCreate(array $customer, $site = null)
     {
         if (! sizeof($customer)) {
-            throw new \InvalidArgumentException('Parameter `customer` must contains a data');
+            throw new \InvalidArgumentException(
+                'Parameter `customer` must contains a data'
+            );
         }
 
-        return $this->client->makeRequest("/customers/create", Client::METHOD_POST, $this->fillSite($site, array(
-            'customer' => json_encode($customer)
-        )));
+        return $this->client->makeRequest(
+            "/customers/create",
+            Client::METHOD_POST,
+            $this->fillSite($site, array('customer' => json_encode($customer)))
+        );
     }
 
     /**
      * Save customer IDs' (id and externalId) association in the CRM
      *
-     * @param array $ids
+     * @param array $ids ids mapping
      *
      * @return ApiResponse
      */
     public function customersFixExternalIds(array $ids)
     {
         if (! sizeof($ids)) {
-            throw new \InvalidArgumentException('Method parameter must contains at least one IDs pair');
+            throw new \InvalidArgumentException(
+                'Method parameter must contains at least one IDs pair'
+            );
         }
 
-        return $this->client->makeRequest("/customers/fix-external-ids", Client::METHOD_POST, array(
-            'customers' => json_encode($ids)
-        ));
+        return $this->client->makeRequest(
+            "/customers/fix-external-ids",
+            Client::METHOD_POST,
+            array('customers' => json_encode($ids))
+        );
     }
 
     /**
      * Upload array of the customers
      *
-     * @param array $customers
-     * @param string $site (default: null)
+     * @param array  $customers array of customers
+     * @param string $site      (default: null)
      *
      * @return ApiResponse
      */
     public function customersUpload(array $customers, $site = null)
     {
         if (! sizeof($customers)) {
-            throw new \InvalidArgumentException('Parameter `customers` must contains array of the customers');
+            throw new \InvalidArgumentException(
+                'Parameter `customers` must contains array of the customers'
+            );
         }
 
-        return $this->client->makeRequest("/customers/upload", Client::METHOD_POST, $this->fillSite($site, array(
-            'customers' => json_encode($customers)
-        )));
+        return $this->client->makeRequest(
+            "/customers/upload",
+            Client::METHOD_POST,
+            $this->fillSite($site, array('customers' => json_encode($customers)))
+        );
     }
 
     /**
      * Get customer by id or externalId
      *
-     * @param string $id
-     * @param string $by (default: 'externalId')
+     * @param string $id   customer identificator
+     * @param string $by   (default: 'externalId')
      * @param string $site (default: null)
      *
      * @return ApiResponse
@@ -319,49 +388,62 @@ class ApiClient
     {
         $this->checkIdParameter($by);
 
-        return $this->client->makeRequest("/customers/$id", Client::METHOD_GET, $this->fillSite($site, array(
-            'by' => $by
-        )));
+        return $this->client->makeRequest(
+            "/customers/$id",
+            Client::METHOD_GET,
+            $this->fillSite($site, array('by' => $by))
+        );
     }
 
     /**
      * Edit a customer
      *
-     * @param array $customer
-     * @param string $by (default: 'externalId')
-     * @param string $site (default: null)
+     * @param array  $customer customer data
+     * @param string $by       (default: 'externalId')
+     * @param string $site     (default: null)
      *
      * @return ApiResponse
      */
     public function customersEdit(array $customer, $by = 'externalId', $site = null)
     {
         if (! sizeof($customer)) {
-            throw new \InvalidArgumentException('Parameter `customer` must contains a data');
+            throw new \InvalidArgumentException(
+                'Parameter `customer` must contains a data'
+            );
         }
 
         $this->checkIdParameter($by);
 
         if (! isset($customer[$by])) {
-            throw new \InvalidArgumentException(sprintf('Customer array must contain the "%s" parameter.', $by));
+            throw new \InvalidArgumentException(
+                sprintf('Customer array must contain the "%s" parameter.', $by)
+            );
         }
 
-        return $this->client->makeRequest("/customers/" . $customer[$by] . "/edit", Client::METHOD_POST, $this->fillSite($site, array(
-            'customer' => json_encode($customer),
-            'by' => $by
-        )));
+        return $this->client->makeRequest(
+            "/customers/" . $customer[$by] . "/edit",
+            Client::METHOD_POST,
+            $this->fillSite(
+                $site,
+                array('customer' => json_encode($customer), 'by' => $by)
+            )
+        );
     }
 
     /**
      * Get orders assembly list
      *
      * @param array $filter (default: array())
-     * @param int $page (default: null)
-     * @param int $limit (default: null)
+     * @param int   $page   (default: null)
+     * @param int   $limit  (default: null)
      *
      * @return ApiResponse
      */
-    public function ordersPacksList(array $filter = array(), $page = null, $limit = null)
-    {
+    public function ordersPacksList(
+        array $filter = array(),
+        $page = null,
+        $limit = null
+    ) {
         $parameters = array();
 
         if (sizeof($filter)) {
@@ -374,13 +456,17 @@ class ApiClient
             $parameters['limit'] = (int) $limit;
         }
 
-        return $this->client->makeRequest('/orders/packs', Client::METHOD_GET, $parameters);
+        return $this->client->makeRequest(
+            '/orders/packs',
+            Client::METHOD_GET,
+            $parameters
+        );
     }
 
     /**
      * Create orders assembly
      *
-     * @param array $pack
+     * @param array  $pack pack data
      * @param string $site (default: null)
      *
      * @return ApiResponse
@@ -388,25 +474,32 @@ class ApiClient
     public function ordersPacksCreate(array $pack, $site = null)
     {
         if (! sizeof($pack)) {
-            throw new \InvalidArgumentException('Parameter `pack` must contains a data');
+            throw new \InvalidArgumentException(
+                'Parameter `pack` must contains a data'
+            );
         }
 
-        return $this->client->makeRequest("/orders/packs/create", Client::METHOD_POST, $this->fillSite($site, array(
-            'pack' => json_encode($pack)
-        )));
+        return $this->client->makeRequest(
+            "/orders/packs/create",
+            Client::METHOD_POST,
+            $this->fillSite($site, array('pack' => json_encode($pack)))
+        );
     }
 
     /**
      * Get orders assembly history
      *
      * @param array $filter (default: array())
-     * @param int $page (default: null)
-     * @param int $limit (default: null)
+     * @param int   $page   (default: null)
+     * @param int   $limit  (default: null)
      *
      * @return ApiResponse
      */
-    public function ordersPacksHistory(array $filter = array(), $page = null, $limit = null)
-    {
+    public function ordersPacksHistory(
+        array $filter = array(),
+        $page = null,
+        $limit = null
+    ) {
         $parameters = array();
 
         if (sizeof($filter)) {
@@ -419,13 +512,17 @@ class ApiClient
             $parameters['limit'] = (int) $limit;
         }
 
-        return $this->client->makeRequest('/orders/packs/history', Client::METHOD_GET, $parameters);
+        return $this->client->makeRequest(
+            '/orders/packs/history',
+            Client::METHOD_GET,
+            $parameters
+        );
     }
 
     /**
      * Get orders assembly by id
      *
-     * @param string $id
+     * @param string $id pack identificator
      *
      * @return ApiResponse
      */
@@ -441,7 +538,7 @@ class ApiClient
     /**
      * Delete orders assembly by id
      *
-     * @param string $id
+     * @param string $id pack identificator
      *
      * @return ApiResponse
      */
@@ -451,13 +548,16 @@ class ApiClient
             throw new \InvalidArgumentException('Parameter `id` must be set');
         }
 
-        return $this->client->makeRequest("/orders/packs/$id/delete", Client::METHOD_POST);
+        return $this->client->makeRequest(
+            "/orders/packs/$id/delete",
+            Client::METHOD_POST
+        );
     }
 
     /**
      * Edit orders assembly
      *
-     * @param array $pack
+     * @param array  $pack pack data
      * @param string $site (default: null)
      *
      * @return ApiResponse
@@ -465,28 +565,36 @@ class ApiClient
     public function ordersPacksEdit(array $pack, $site = null)
     {
         if (! sizeof($pack) || empty($pack['id'])) {
-            throw new \InvalidArgumentException('Parameter `pack` must contains a data & pack `id` must be set');
+            throw new \InvalidArgumentException(
+                'Parameter `pack` must contains a data & pack `id` must be set'
+            );
         }
 
         $id = $pack['id'];
 
-        return $this->client->makeRequest("/orders/packs/$id/edit", Client::METHOD_POST, $this->fillSite($site, array(
-            'pack' => json_encode($pack)
-        )));
+        return $this->client->makeRequest(
+            "/orders/packs/$id/edit",
+            Client::METHOD_POST,
+            $this->fillSite($site, array('pack' => json_encode($pack)))
+        );
     }
 
     /**
      * Get purchace prices & stock balance
      *
-     * @param array $filter (default: array())
-     * @param int $page (default: null)
-     * @param int $limit (default: null)
-     * @param string $site (default: null)
+     * @param array  $filter (default: array())
+     * @param int    $page   (default: null)
+     * @param int    $limit  (default: null)
+     * @param string $site   (default: null)
      *
      * @return ApiResponse
      */
-    public function storeInventories(array $filter = array(), $page = null, $limit = null, $site = null)
-    {
+    public function storeInventories(
+        array $filter = array(),
+        $page = null,
+        $limit = null,
+        $site = null
+    ) {
         $parameters = array();
 
         if (sizeof($filter)) {
@@ -499,26 +607,34 @@ class ApiClient
             $parameters['limit'] = (int) $limit;
         }
 
-        return $this->client->makeRequest('/store/inventories', Client::METHOD_GET, $this->fillSite($site, $parameters));
+        return $this->client->makeRequest(
+            '/store/inventories',
+            Client::METHOD_GET,
+            $this->fillSite($site, $parameters)
+        );
     }
 
     /**
      * Upload store inventories
      *
-     * @param array $offers
-     * @param string $site (default: null)
+     * @param array  $offers offers data
+     * @param string $site   (default: null)
      *
      * @return ApiResponse
      */
     public function storeInventoriesUpload(array $offers, $site = null)
     {
         if (! sizeof($offers)) {
-            throw new \InvalidArgumentException('Parameter `offers` must contains array of the offers');
+            throw new \InvalidArgumentException(
+                'Parameter `offers` must contains array of the offers'
+            );
         }
 
-        return $this->client->makeRequest("/store/inventories/upload", Client::METHOD_POST, $this->fillSite($site, array(
-            'offers' => json_encode($offers)
-        )));
+        return $this->client->makeRequest(
+            "/store/inventories/upload",
+            Client::METHOD_POST,
+            $this->fillSite($site, array('offers' => json_encode($offers)))
+        );
     }
 
     /**
@@ -528,7 +644,10 @@ class ApiClient
      */
     public function countriesList()
     {
-        return $this->client->makeRequest('/reference/countries', Client::METHOD_GET);
+        return $this->client->makeRequest(
+            '/reference/countries',
+            Client::METHOD_GET
+        );
     }
 
     /**
@@ -538,7 +657,10 @@ class ApiClient
      */
     public function deliveryServicesList()
     {
-        return $this->client->makeRequest('/reference/delivery-services', Client::METHOD_GET);
+        return $this->client->makeRequest(
+            '/reference/delivery-services',
+            Client::METHOD_GET
+        );
     }
 
     /**
@@ -551,12 +673,16 @@ class ApiClient
     public function deliveryServicesEdit(array $data)
     {
         if (! isset($data['code'])) {
-            throw new \InvalidArgumentException('Data must contain "code" parameter.');
+            throw new \InvalidArgumentException(
+                'Data must contain "code" parameter.'
+            );
         }
 
-        return $this->client->makeRequest('/reference/delivery-services/' . $data['code'] . '/edit', Client::METHOD_POST, array(
-            'deliveryService' => json_encode($data)
-        ));
+        return $this->client->makeRequest(
+            '/reference/delivery-services/' . $data['code'] . '/edit',
+            Client::METHOD_POST,
+            array('deliveryService' => json_encode($data))
+        );
     }
 
     /**
@@ -566,7 +692,10 @@ class ApiClient
      */
     public function deliveryTypesList()
     {
-        return $this->client->makeRequest('/reference/delivery-types', Client::METHOD_GET);
+        return $this->client->makeRequest(
+            '/reference/delivery-types',
+            Client::METHOD_GET
+        );
     }
 
     /**
@@ -579,12 +708,16 @@ class ApiClient
     public function deliveryTypesEdit(array $data)
     {
         if (! isset($data['code'])) {
-            throw new \InvalidArgumentException('Data must contain "code" parameter.');
+            throw new \InvalidArgumentException(
+                'Data must contain "code" parameter.'
+            );
         }
 
-        return $this->client->makeRequest('/reference/delivery-types/' . $data['code'] . '/edit', Client::METHOD_POST, array(
-            'deliveryType' => json_encode($data)
-        ));
+        return $this->client->makeRequest(
+            '/reference/delivery-types/' . $data['code'] . '/edit',
+            Client::METHOD_POST,
+            array('deliveryType' => json_encode($data))
+        );
     }
 
     /**
@@ -594,7 +727,9 @@ class ApiClient
      */
     public function orderMethodsList()
     {
-        return $this->client->makeRequest('/reference/order-methods', Client::METHOD_GET);
+        return $this->client->makeRequest(
+            '/reference/order-methods', Client::METHOD_GET
+        );
     }
 
     /**
@@ -607,12 +742,16 @@ class ApiClient
     public function orderMethodsEdit(array $data)
     {
         if (! isset($data['code'])) {
-            throw new \InvalidArgumentException('Data must contain "code" parameter.');
+            throw new \InvalidArgumentException(
+                'Data must contain "code" parameter.'
+            );
         }
 
-        return $this->client->makeRequest('/reference/order-methods/' . $data['code'] . '/edit', Client::METHOD_POST, array(
-            'orderMethod' => json_encode($data)
-        ));
+        return $this->client->makeRequest(
+            '/reference/order-methods/' . $data['code'] . '/edit',
+            Client::METHOD_POST,
+            array('orderMethod' => json_encode($data))
+        );
     }
 
     /**
@@ -622,7 +761,10 @@ class ApiClient
      */
     public function orderTypesList()
     {
-        return $this->client->makeRequest('/reference/order-types', Client::METHOD_GET);
+        return $this->client->makeRequest(
+            '/reference/order-types',
+            Client::METHOD_GET
+        );
     }
 
     /**
@@ -635,12 +777,16 @@ class ApiClient
     public function orderTypesEdit(array $data)
     {
         if (! isset($data['code'])) {
-            throw new \InvalidArgumentException('Data must contain "code" parameter.');
+            throw new \InvalidArgumentException(
+                'Data must contain "code" parameter.'
+            );
         }
 
-        return $this->client->makeRequest('/reference/order-types/' . $data['code'] . '/edit', Client::METHOD_POST, array(
-            'orderType' => json_encode($data)
-        ));
+        return $this->client->makeRequest(
+            '/reference/order-types/' . $data['code'] . '/edit',
+            Client::METHOD_POST,
+            array('orderType' => json_encode($data))
+        );
     }
 
     /**
@@ -650,7 +796,10 @@ class ApiClient
      */
     public function paymentStatusesList()
     {
-        return $this->client->makeRequest('/reference/payment-statuses', Client::METHOD_GET);
+        return $this->client->makeRequest(
+            '/reference/payment-statuses',
+            Client::METHOD_GET
+        );
     }
 
     /**
@@ -663,12 +812,16 @@ class ApiClient
     public function paymentStatusesEdit(array $data)
     {
         if (! isset($data['code'])) {
-            throw new \InvalidArgumentException('Data must contain "code" parameter.');
+            throw new \InvalidArgumentException(
+                'Data must contain "code" parameter.'
+            );
         }
 
-        return $this->client->makeRequest('/reference/payment-statuses/' . $data['code'] . '/edit', Client::METHOD_POST, array(
-            'paymentStatus' => json_encode($data)
-        ));
+        return $this->client->makeRequest(
+            '/reference/payment-statuses/' . $data['code'] . '/edit',
+            Client::METHOD_POST,
+            array('paymentStatus' => json_encode($data))
+        );
     }
 
     /**
@@ -678,7 +831,10 @@ class ApiClient
      */
     public function paymentTypesList()
     {
-        return $this->client->makeRequest('/reference/payment-types', Client::METHOD_GET);
+        return $this->client->makeRequest(
+            '/reference/payment-types',
+            Client::METHOD_GET
+        );
     }
 
     /**
@@ -691,12 +847,16 @@ class ApiClient
     public function paymentTypesEdit(array $data)
     {
         if (! isset($data['code'])) {
-            throw new \InvalidArgumentException('Data must contain "code" parameter.');
+            throw new \InvalidArgumentException(
+                'Data must contain "code" parameter.'
+            );
         }
 
-        return $this->client->makeRequest('/reference/payment-types/' . $data['code'] . '/edit', Client::METHOD_POST, array(
-            'paymentType' => json_encode($data)
-        ));
+        return $this->client->makeRequest(
+            '/reference/payment-types/' . $data['code'] . '/edit',
+            Client::METHOD_POST,
+            array('paymentType' => json_encode($data))
+        );
     }
 
     /**
@@ -706,7 +866,10 @@ class ApiClient
      */
     public function productStatusesList()
     {
-        return $this->client->makeRequest('/reference/product-statuses', Client::METHOD_GET);
+        return $this->client->makeRequest(
+            '/reference/product-statuses',
+            Client::METHOD_GET
+        );
     }
 
     /**
@@ -719,12 +882,16 @@ class ApiClient
     public function productStatusesEdit(array $data)
     {
         if (! isset($data['code'])) {
-            throw new \InvalidArgumentException('Data must contain "code" parameter.');
+            throw new \InvalidArgumentException(
+                'Data must contain "code" parameter.'
+            );
         }
 
-        return $this->client->makeRequest('/reference/product-statuses/' . $data['code'] . '/edit', Client::METHOD_POST, array(
-            'productStatus' => json_encode($data)
-        ));
+        return $this->client->makeRequest(
+            '/reference/product-statuses/' . $data['code'] . '/edit',
+            Client::METHOD_POST,
+            array('productStatus' => json_encode($data))
+        );
     }
 
     /**
@@ -747,12 +914,16 @@ class ApiClient
     public function sitesEdit(array $data)
     {
         if (! isset($data['code'])) {
-            throw new \InvalidArgumentException('Data must contain "code" parameter.');
+            throw new \InvalidArgumentException(
+                'Data must contain "code" parameter.'
+            );
         }
 
-        return $this->client->makeRequest('/reference/sites/' . $data['code'] . '/edit', Client::METHOD_POST, array(
-            'site' => json_encode($data)
-        ));
+        return $this->client->makeRequest(
+            '/reference/sites/' . $data['code'] . '/edit',
+            Client::METHOD_POST,
+            array('site' => json_encode($data))
+        );
     }
 
     /**
@@ -762,7 +933,10 @@ class ApiClient
      */
     public function statusGroupsList()
     {
-        return $this->client->makeRequest('/reference/status-groups', Client::METHOD_GET);
+        return $this->client->makeRequest(
+            '/reference/status-groups',
+            Client::METHOD_GET
+        );
     }
 
     /**
@@ -785,12 +959,16 @@ class ApiClient
     public function statusesEdit(array $data)
     {
         if (! isset($data['code'])) {
-            throw new \InvalidArgumentException('Data must contain "code" parameter.');
+            throw new \InvalidArgumentException(
+                'Data must contain "code" parameter.'
+            );
         }
 
-        return $this->client->makeRequest('/reference/statuses/' . $data['code'] . '/edit', Client::METHOD_POST, array(
-            'status' => json_encode($data)
-        ));
+        return $this->client->makeRequest(
+            '/reference/statuses/' . $data['code'] . '/edit',
+            Client::METHOD_POST,
+            array('status' => json_encode($data))
+        );
     }
 
     /**
@@ -813,16 +991,22 @@ class ApiClient
     public function storesEdit(array $data)
     {
         if (! isset($data['code'])) {
-            throw new \InvalidArgumentException('Data must contain "code" parameter.');
+            throw new \InvalidArgumentException(
+                'Data must contain "code" parameter.'
+            );
         }
 
         if (! isset($data['name'])) {
-            throw new \InvalidArgumentException('Data must contain "name" parameter.');
+            throw new \InvalidArgumentException(
+                'Data must contain "name" parameter.'
+            );
         }
 
-        return $this->client->makeRequest('/reference/stores/' . $data['code'] . '/edit', Client::METHOD_POST, array(
-            'store' => json_encode($data)
-        ));
+        return $this->client->makeRequest(
+            '/reference/stores/' . $data['code'] . '/edit',
+            Client::METHOD_POST,
+            array('store' => json_encode($data))
+        );
     }
 
     /**
@@ -838,10 +1022,10 @@ class ApiClient
     /**
      * Call event
      *
-     * @param string $phone
-     * @param string $type
-     * @param string $code
-     * @param string $status
+     * @param string $phone  phone number
+     * @param string $type   call type
+     * @param string $code   additional phone code
+     * @param string $status call status
      *
      * @return ApiResponse
      */
@@ -866,30 +1050,41 @@ class ApiClient
         $parameters['code'] = $code;
         $parameters['hangupStatus'] = $status;
 
-        return $this->client->makeRequest('/telephony/call/event', Client::METHOD_POST, $parameters);
+        return $this->client->makeRequest(
+            '/telephony/call/event',
+            Client::METHOD_POST,
+            $parameters
+        );
     }
 
     /**
      * Upload calls
      *
-     * @param array $calls
+     * @param array $calls calls data
      *
      * @return ApiResponse
      */
     public function telephonyCallsUpload(array $calls)
     {
         if (! sizeof($calls)) {
-            throw new \InvalidArgumentException('Parameter `calls` must contains array of the calls');
+            throw new \InvalidArgumentException(
+                'Parameter `calls` must contains array of the calls'
+            );
         }
 
-        return $this->client->makeRequest("/telephony/calls/upload", Client::METHOD_POST, array(
-            'calls' => json_encode($calls)
-        ));
+        return $this->client->makeRequest(
+            "/telephony/calls/upload",
+            Client::METHOD_POST,
+            array('calls' => json_encode($calls))
+        );
     }
 
     /**
      * Get call manager
      *
+     * @param string $phone   phone number
+     * @param bool   $details detailed information
+     *
      * @return ApiResponse
      */
     public function telephonyCallManager($phone, $details)
@@ -901,7 +1096,10 @@ class ApiClient
         $parameters['phone'] = $phone;
         $parameters['details'] = isset($details) ? $details : 0;
 
-        return $this->client->makeRequest('/telephony/manager', Client::METHOD_GET, $parameters);
+        return $this->client->makeRequest(
+            '/telephony/manager',
+            Client::METHOD_GET, $parameters
+        );
     }
 
     /**
@@ -917,7 +1115,7 @@ class ApiClient
     /**
      * Set site
      *
-     * @param string $site
+     * @param string $site site code
      *
      * @return void
      */
@@ -929,7 +1127,7 @@ class ApiClient
     /**
      * Check ID parameter
      *
-     * @param string $by
+     * @param string $by identify by
      *
      * @return bool
      */
@@ -939,8 +1137,15 @@ class ApiClient
             'externalId',
             'id'
         );
-        if (! in_array($by, $allowedForBy)) {
-            throw new \InvalidArgumentException(sprintf('Value "%s" for parameter "by" is not valid. Allowed values are %s.', $by, implode(', ', $allowedForBy)));
+
+        if (!in_array($by, $allowedForBy)) {
+            throw new \InvalidArgumentException(
+                sprintf(
+                    'Value "%s" for parameter "by" is not valid. Allowed values are %s.',
+                    $by,
+                    implode(', ', $allowedForBy)
+                )
+            );
         }
 
         return true;
@@ -949,8 +1154,8 @@ class ApiClient
     /**
      * Fill params by site value
      *
-     * @param string $site
-     * @param array $params
+     * @param string $site   site code
+     * @param array  $params input parameters
      *
      * @return array
      */
diff --git a/lib/RetailCrm/Exception/CurlException.php b/lib/RetailCrm/Exception/CurlException.php
index 08a0924..d3b8e1a 100644
--- a/lib/RetailCrm/Exception/CurlException.php
+++ b/lib/RetailCrm/Exception/CurlException.php
@@ -2,6 +2,17 @@
 
 namespace RetailCrm\Exception;
 
+/**
+ * PHP version 5.3
+ *
+ * Class CurlException
+ *
+ * @category RetailCrm
+ * @package  RetailCrm
+ * @author   RetailCrm <integration@retailcrm.ru>
+ * @license  https://opensource.org/licenses/MIT MIT License
+ * @link     http://www.retailcrm.ru/docs/Developers/ApiVersion3
+ */
 class CurlException extends \RuntimeException
 {
 }
diff --git a/lib/RetailCrm/Exception/InvalidJsonException.php b/lib/RetailCrm/Exception/InvalidJsonException.php
index 979d12e..1a06536 100644
--- a/lib/RetailCrm/Exception/InvalidJsonException.php
+++ b/lib/RetailCrm/Exception/InvalidJsonException.php
@@ -2,6 +2,17 @@
 
 namespace RetailCrm\Exception;
 
+/**
+ * PHP version 5.3
+ *
+ * Class InvalidJsonException
+ *
+ * @category RetailCrm
+ * @package  RetailCrm
+ * @author   RetailCrm <integration@retailcrm.ru>
+ * @license  https://opensource.org/licenses/MIT MIT License
+ * @link     http://www.retailcrm.ru/docs/Developers/ApiVersion3
+ */
 class InvalidJsonException extends \DomainException
 {
 }
diff --git a/lib/RetailCrm/Http/Client.php b/lib/RetailCrm/Http/Client.php
index 8d011fb..27e65a4 100644
--- a/lib/RetailCrm/Http/Client.php
+++ b/lib/RetailCrm/Http/Client.php
@@ -6,7 +6,15 @@ use RetailCrm\Exception\CurlException;
 use RetailCrm\Response\ApiResponse;
 
 /**
+ * PHP version 5.3
+ *
  * HTTP client
+ *
+ * @category RetailCrm
+ * @package  RetailCrm
+ * @author   RetailCrm <integration@retailcrm.ru>
+ * @license  https://opensource.org/licenses/MIT MIT License
+ * @link     http://www.retailcrm.ru/docs/Developers/ApiVersion3
  */
 class Client
 {
@@ -17,26 +25,47 @@ class Client
     protected $defaultParameters;
     protected $retry;
 
+    /**
+     * Client constructor.
+     *
+     * @param string $url               api url
+     * @param array  $defaultParameters array of parameters
+     */
     public function __construct($url, array $defaultParameters = array())
     {
         if (false === stripos($url, 'https://')) {
-            throw new \InvalidArgumentException('API schema requires HTTPS protocol');
+            throw new \InvalidArgumentException(
+                'API schema requires HTTPS protocol'
+            );
         }
 
         $this->url = $url;
         $this->defaultParameters = $defaultParameters;
         $this->retry = 0;
+        $this->curlErrors = array(
+            CURLE_COULDNT_RESOLVE_PROXY,
+            CURLE_COULDNT_RESOLVE_HOST,
+            CURLE_COULDNT_CONNECT,
+            CURLE_OPERATION_TIMEOUTED,
+            CURLE_HTTP_POST_ERROR,
+            CURLE_SSL_CONNECT_ERROR,
+            CURLE_SEND_ERROR,
+            CURLE_RECV_ERROR
+        );
     }
 
     /**
      * Make HTTP request
      *
-     * @param string $path
-     * @param string $method (default: 'GET')
-     * @param array $parameters (default: array())
-     * @param int $timeout
-     * @param bool $verify
-     * @param bool $debug
+     * @param string $path       request url
+     * @param string $method     (default: 'GET')
+     * @param array  $parameters (default: array())
+     * @param int    $timeout    (default: 30)
+     * @param bool   $verify     (default: false)
+     * @param bool   $debug      (default: false)
+     *
+     * @SuppressWarnings(PHPMD.ExcessiveParameterList)
+     *
      * @return ApiResponse
      */
     public function makeRequest(
@@ -49,11 +78,13 @@ class Client
     ) {
         $allowedMethods = array(self::METHOD_GET, self::METHOD_POST);
         if (!in_array($method, $allowedMethods)) {
-            throw new \InvalidArgumentException(sprintf(
-                'Method "%s" is not valid. Allowed methods are %s',
-                $method,
-                implode(', ', $allowedMethods)
-            ));
+            throw new \InvalidArgumentException(
+                sprintf(
+                    'Method "%s" is not valid. Allowed methods are %s',
+                    $method,
+                    implode(', ', $allowedMethods)
+                )
+            );
         }
 
         $parameters = array_merge($this->defaultParameters, $parameters);
@@ -76,7 +107,11 @@ class Client
             curl_setopt($ch, CURLOPT_TIMEOUT, (int) $timeout);
             curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, (int) $timeout);
         } else {
-            curl_setopt($ch, CURLOPT_TIMEOUT_MS, (int) $timeout + ($this->retry * 2000));
+            curl_setopt(
+                $ch,
+                CURLOPT_TIMEOUT_MS,
+                (int) $timeout + ($this->retry * 2000)
+            );
         }
 
         if (self::METHOD_POST === $method) {
@@ -91,7 +126,7 @@ class Client
 
         curl_close($ch);
 
-        if ($errno && in_array($errno, array(6, 7, 28, 34, 35)) && $this->retry < 3) {
+        if ($errno && in_array($errno, $this->curlErrors) && $this->retry < 3) {
             $errno = null;
             $error = null;
             $this->retry += 1;
@@ -112,6 +147,11 @@ class Client
         return new ApiResponse($statusCode, $responseBody);
     }
 
+    /**
+     * Retry connect
+     *
+     * @return int
+     */
     public function getRetry()
     {
         return $this->retry;
diff --git a/lib/RetailCrm/Response/ApiResponse.php b/lib/RetailCrm/Response/ApiResponse.php
index 3997a72..5ae57d3 100644
--- a/lib/RetailCrm/Response/ApiResponse.php
+++ b/lib/RetailCrm/Response/ApiResponse.php
@@ -5,7 +5,15 @@ namespace RetailCrm\Response;
 use RetailCrm\Exception\InvalidJsonException;
 
 /**
+ * PHP version 5.3
+ *
  * Response from retailCRM API
+ *
+ * @category RetailCrm
+ * @package  RetailCrm
+ * @author   RetailCrm <integration@retailcrm.ru>
+ * @license  https://opensource.org/licenses/MIT MIT License
+ * @link     http://www.retailcrm.ru/docs/Developers/ApiVersion3
  */
 class ApiResponse implements \ArrayAccess
 {
@@ -15,6 +23,12 @@ class ApiResponse implements \ArrayAccess
     // response assoc array
     protected $response;
 
+    /**
+     * ApiResponse constructor.
+     *
+     * @param int   $statusCode   HTTP status code
+     * @param mixed $responseBody HTTP body
+     */
     public function __construct($statusCode, $responseBody = null)
     {
         $this->statusCode = (int) $statusCode;