update: knowledge var

app/Http/Controllers/User/KnowledgeController.php

@@ -28,6 +28,15 @@ class KnowledgeController extends Controller
             $knowledge['body'] = str_replace('{{appleIdPassword}}', $appleIdPassword, $knowledge['body']);
             $knowledge['body'] = str_replace('{{subscribeUrl}}', $subscribeUrl, $knowledge['body']);
             $knowledge['body'] = str_replace('{{urlEncodeSubscribeUrl}}', urlencode($subscribeUrl), $knowledge['body']);
+            $knowledge['body'] = str_replace(
+                '{{safeBase64SubscribeUrl}}',
+                str_replace(
+                    array('+', '/', '='),
+                    array('-', '_', ''),
+                    base64_encode($subscribeUrl)
+                ),
+                $knowledge['body']
+            );
             return response([
                 'data' => $knowledge
             ]);