diff --git a/app/src/Service/API.php b/app/src/Service/API.php
new file mode 100644
index 0000000..7a30d77
--- /dev/null
+++ b/app/src/Service/API.php
@@ -0,0 +1,23 @@
+<?php
+namespace Incoviba\Service;
+
+use Psr\Http\Message\ServerRequestInterface;
+use Incoviba\Common\Ideal;
+use Incoviba\Exception\MissingAuthorizationHeader;
+
+class API extends Ideal\Service
+{
+    /**
+     * @throws MissingAuthorizationHeader
+     */
+    public function getKey(ServerRequestInterface $request): string
+    {
+        $auth_headers = $request->getHeader('Authorization');
+        foreach ($auth_headers as $header) {
+            if (str_contains($header, 'Bearer')) {
+                return substr($header, strlen('Bearer '));
+            }
+        }
+        throw new MissingAuthorizationHeader();
+    }
+}