Issue #3436853: Send entire API key for every API call

Closes #3436853

src/Service/GcNotifyApiService.php

@@ -240,10 +240,9 @@ class GcNotifyApiService {
     };
     $apikey = $config->get($mode . '_apikey');
 
-    $secret = substr($apikey, -36);
     $headers = [
       'Content-type' => 'application/json',
-      'Authorization' => "ApiKey-v1 $secret",
+      'Authorization' => 'ApiKey-v1 ' . $apikey,
     ];
 
     $request_body = json_encode($request_body);