diff --git a/README.md b/README.md
index c554d43..cf9900a 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@
 \SatispayOnline\Api::setSecurityBearer('yoursecuritybearer');
 
 try {
-  \SatispayOnline\Bearer:check();
+  \SatispayOnline\Bearer::check();
   echo 'OK';
 } catch(\Exception $ex) {
   echo 'Invalid Security Bearer';
diff --git a/lib/Api.php b/lib/Api.php
index fde1aa3..128f8c1 100644
--- a/lib/Api.php
+++ b/lib/Api.php
@@ -1,11 +1,14 @@
 <?php
 namespace SatispayOnline;
 
+define('SDKVERSION', '1.3.0');
+
 class Api {
   public static $securityBearer;
   public static $urlStaging = 'https://staging.authservices.satispay.com';
   public static $url = 'https://authservices.satispay.com';
   public static $staging = false;
+  public static $client = null;
 
   public static function setSecurityBearer($securityBearer) {
     self::$securityBearer = $securityBearer;
@@ -19,6 +22,10 @@ public static function setStaging($staging) {
     self::$staging = $staging;
   }
 
+  public static function setClient($client) {
+    self::$client = $client;
+  }
+
   public static function request($url, $method = null, $params = null) {
     $opts = [];
     $curl = curl_init();
@@ -36,7 +43,12 @@ public static function request($url, $method = null, $params = null) {
 
     $headers = [
       'Authorization: Bearer '.self::$securityBearer,
-      'Content-Type: application/json'
+      'Content-Type: application/json',
+      'X-Satispay-Client: '.join(' ', [
+        self::$client,
+        'PHP/'.phpversion()
+      ]),
+      'User-Agent: SatispayOnlineApi-PHPSDK/'.SDKVERSION
     ];
     $opts[CURLOPT_HTTPHEADER] = $headers;