diff --git a/Api.php b/Api.php
index 862b466..2fe65e1 100644
--- a/Api.php
+++ b/Api.php
@@ -32,14 +32,21 @@ class Api
      * @var ClientInterface
      */
     private $client;
-    
+
+    /**
+     * @var array
+     */
+    private $config = [];
+
     /**
      * @param AuthInterface $auth
+     * @param array $config additional config setting for client service
      */
-    public function __construct(AuthInterface $auth)
+    public function __construct(AuthInterface $auth, $config = [])
     {
         $this->auth = $auth;
         $this->auth->setContext($this);
+        $this->config = $config;
     }
     
     /**
@@ -280,7 +287,7 @@ public function request($method, $params = [])
     public function getClient()
     {
         if ($this->client === null) {
-            $this->client = new Client();
+            $this->client = new Client($this->config);
         }
         
         return $this->client;
diff --git a/Client/Client.php b/Client/Client.php
index 72b9c21..7772d57 100644
--- a/Client/Client.php
+++ b/Client/Client.php
@@ -6,12 +6,26 @@
 
 class Client implements ClientInterface
 {
+    /**
+     * Additional configuration for Guzzle Client.
+     * For example @link http://docs.guzzlephp.org/en/stable/request-options.html#verify
+     * @var array
+     */
+    protected $config = [];
 
     /**
      * @var string
      */
     private $baseUrl = 'https://sms.ru/{method}';
 
+    /**
+     * @param array $config
+     */
+    public function __construct($config = [])
+    {
+        $this->config = $config;
+    }
+
     /**
      * @param string $method
      * @param array $params
@@ -24,7 +38,10 @@ public function request($method, $params = [])
     {
         $client = new \GuzzleHttp\Client();
 
-        $response = $client->post($this->getUrl($method), ['query' => $params]);
+        // Merge with specific config
+        $params = array_merge($this->config, ['query' => $params]);
+
+        $response = $client->post($this->getUrl($method), $params);
 
         if ($response->getStatusCode() === 200) {
             return (string)$response->getBody();
diff --git a/Client/ClientInterface.php b/Client/ClientInterface.php
index ede802f..1142da4 100644
--- a/Client/ClientInterface.php
+++ b/Client/ClientInterface.php
@@ -5,6 +5,12 @@
 interface ClientInterface
 {
 
+    /**
+     * Provides an additional configs for client service
+     * @param array $config
+     */
+    public function __construct($config = []);
+
     /**
      * @param string $method
      * @param array $params