config: add fuel_finder service credentials

config/services.php

@@ -35,4 +35,10 @@ return [
         ],
     ],
 
+    'fuel_finder' => [
+        'base_url'      => env('FUEL_FINDER_BASE_URL', 'https://www.fuel-finder.service.gov.uk/api/v1'),
+        'client_id'     => env('FUEL_FINDER_CLIENT_ID'),
+        'client_secret' => env('FUEL_FINDER_CLIENT_SECRET'),
+    ],
+
 ];