diff --git a/src/HttpClient/Plugin/Authentication.php b/src/HttpClient/Plugin/Authentication.php
index 816ffdc..06b1d43 100644
--- a/src/HttpClient/Plugin/Authentication.php
+++ b/src/HttpClient/Plugin/Authentication.php
@@ -34,7 +34,7 @@ public function __construct(string $tokenOrLogin, ?string $password, ?string $me
     public function doHandleRequest(RequestInterface $request, callable $next, callable $first): Promise
     {
         $request = $request->withHeader(
-            'Authorization',
+            'X-API-Key',
             $this->getAuthorizationHeader()
         );
 
@@ -45,7 +45,7 @@ private function getAuthorizationHeader(): string
     {
         switch ($this->method) {
             case Client::AUTH_ACCESS_TOKEN:
-                return sprintf('Bearer %s', $this->tokenOrLogin);
+                return $this->tokenOrLogin;
             default:
                 throw new RuntimeException(sprintf('%s not yet implemented', $this->method));
         }