Handle case-insensitive payload keys

server.js

@@ -61,11 +61,15 @@ function parseMessage(buffer) {
   const body = buffer.toString("utf8");
   try {
     const parsed = JSON.parse(body);
+    const normalized = Object.keys(parsed || {}).reduce((acc, key) => {
+      acc[key.toLowerCase()] = parsed[key];
+      return acc;
+    }, {});
     return {
-      action: parsed.action || "create",
-      id: parsed.id,
-      text: parsed.text,
-      requestId: parsed.request_id,
+      action: normalized.action || "create",
+      id: normalized.id,
+      text: normalized.text,
+      requestId: normalized.request_id || normalized.requestid,
     };
   } catch {
     return {