debug

src/ApiKernel.php

@@ -2206,6 +2206,12 @@ class ApiKernel
 
     private function handleTemplateReferences(): void
     {
+        @file_put_contents(sys_get_temp_dir() . '/emailtemplate_debug.log', json_encode([
+            'time' => date(DATE_ATOM),
+            'tag' => 'handleTemplateReferences',
+            'input' => $this->in ?? null,
+        ], JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES) . "\n", FILE_APPEND);
+
         $auth = $this->requireAuth();
         $customerId = (int)($auth['customer_id'] ?? 0);
         if ($customerId <= 0) {