diff --git a/src/Clients/MindboxClientV3.php b/src/Clients/MindboxClientV3.php
index 80ab50d..17661bb 100644
--- a/src/Clients/MindboxClientV3.php
+++ b/src/Clients/MindboxClientV3.php
@@ -26,9 +26,9 @@ class MindboxClientV3 extends AbstractMindboxClient
 
     const TMP_V3_URL = 'https://api-ru.mindbox.cloud/v3/operations/';
     /**
-     * Секретный ключ.
+     * Имя схемы авторизации по секретному ключу.
      */
-    const SECRET_KEY_NAME = 'Mindbox secretKey';
+    const SECRET_KEY_AUTHORIZATION_SCHEME_NAME = 'SecretKey';
 
     /**
      * @var string Доменная зона API.
@@ -143,7 +143,7 @@ private function getDeviceUUID()
      */
     protected function prepareAuthorizationHeader()
     {
-        return static::SECRET_KEY_NAME . '="' . $this->secretKey . '"';
+        return static::SECRET_KEY_AUTHORIZATION_SCHEME_NAME . ' ' . $this->secretKey;
     }
 
     /**
diff --git a/tests/Clients/MindboxClientV3Test.php b/tests/Clients/MindboxClientV3Test.php
index 21eac33..08106c2 100644
--- a/tests/Clients/MindboxClientV3Test.php
+++ b/tests/Clients/MindboxClientV3Test.php
@@ -37,7 +37,7 @@ public function expectedArgsForSendProvider()
                     'headers' => [
                         'Accept'        => 'application/json',
                         'Content-Type'  => 'application/json',
-                        'Authorization' => 'Mindbox secretKey="' . $this->secret . '"',
+                        'Authorization' => 'SecretKey ' . $this->secret,
                         'X-Customer-IP' => '',
                         'Mindbox-Integration' => 'PhpSDK',
                         'Mindbox-Integration-Version' => '1.0'
@@ -61,7 +61,7 @@ public function expectedArgsForSendProvider()
                     'headers' => [
                         'Accept'        => 'application/json',
                         'Content-Type'  => 'application/json',
-                        'Authorization' => 'Mindbox secretKey="' . $this->secret . '"',
+                        'Authorization' => 'SecretKey ' . $this->secret,
                         'X-Customer-IP' => '',
                         'Mindbox-Integration' => 'PhpSDK',
                         'Mindbox-Integration-Version' => '1.0'
@@ -86,7 +86,7 @@ public function expectedArgsForSendProvider()
                     'headers' => [
                         'Accept'        => 'application/json',
                         'Content-Type'  => 'application/json',
-                        'Authorization' => 'Mindbox secretKey="' . $this->secret . '"',
+                        'Authorization' => 'SecretKey ' . $this->secret,
                         'Mindbox-Integration' => 'PhpSDK',
                         'Mindbox-Integration-Version' => '1.0'
                     ],