diff --git a/functions/index.js b/functions/index.js
index 0b23b0d..ba7496f 100644
--- a/functions/index.js
+++ b/functions/index.js
@@ -50,6 +50,9 @@ exports.shopdmPayWebhook = onRequest(
 
     if (!isValid) {
       console.error("Invalid webhook signature");
+      console.error("Received signature:", signature);
+      console.error("Payload keys:", Object.keys(payload).sort().join(", "));
+      console.error("Secrets tried:", secrets.length);
       res.status(401).send("Unauthorized");
       return;
     }