diff --git a/src/Octopush/Api/Client.php b/src/Octopush/Api/Client.php
index 28f41da..067c4e4 100644
--- a/src/Octopush/Api/Client.php
+++ b/src/Octopush/Api/Client.php
@@ -70,6 +70,13 @@ class Client
      */
     private $requestMode = self::REQUEST_MODE_REAL;
 
+    /**
+     * Allows you to choose transactional mode.
+     *
+     * @var bool
+     */
+    private $transactional = false;
+
     /**
      * Lists the key fields of the application you want to add in the sha1 hash.
      *
@@ -123,6 +130,11 @@ public function setRequestKeys($requestKeys)
         $this->requestKeys = $requestKeys;
     }
 
+    public function setTransactional()
+    {
+        $this->transactional=true;
+    }
+
     /**
      * Sends a simple SMS.
      *
@@ -144,6 +156,10 @@ public function send($smsText)
             'request_mode' => $this->requestMode,
         ];
 
+        if ($this->transactional) {
+            $data['transactional'] = 1;
+        }
+
         if ($this->withReplies) {
             $data['with_replies'] = 1;
         }