Google Play Console RTDN Not Working – 403 Error & No Messages Reaching RevenueCat

Question

I’m trying to set up Real-Time Developer Notifications (RTDN) for my app, but I’m facing issues where I can’t even send a test notification from the Monetization setup page in Google Play Console.

Setup:

• Pub/Sub topic is configured ✅
• IAM permissions and service account are set correctly ✅
• RevenueCat is my server for handling RTDN
• Webhook URL is publicly accessible ✅

The issue:

• When sending a test notification from Google Play Console, I get a 403 error.

• In the Google Play Android Developer API dashboard, I see this error in the topic:

  Error calling androidpublisher.SubscriptionPurchasesV2Service.Get: Value: 100%
  

• My Pub/Sub subscription (configured for RevenueCat) does not receive any messages.

Play Console Error

What I’ve tried:

1. Checked IAM roles – Service account has Pub/Sub Publisher, Subscriber, and Play Console API permissions.
2. Verified Pub/Sub topic & subscription – Everything looks correctly configured.
3. Tested API calls manually – Ensured that my service account can call the Google Play Developer API.
4. Reviewed Google Cloud Logs – No clear indication of why the 403 error is happening.
5. Recreated the Pub/Sub topic & subscription – No change in behavior.

Expected Behavior:

• When I send a test notification from the Google Play Console Monetization setup, it should be successfully published to my Pub/Sub topic.
• My Pub/Sub subscription (configured for RevenueCat) should receive the message and forward it to RevenueCat's webhook.
• RevenueCat should process the notification and update the purchase status accordingly.

Despite extensive troubleshooting, I haven’t been able to resolve this issue, and I couldn’t find relevant solutions online.

Question:

• What could be causing this 403 error when sending test notifications?
• Has anyone successfully set up RTDN with RevenueCat and resolved this type of issue?
• Are there additional Google Cloud or Play Console settings I might be missing?

Any guidance would be greatly appreciated![enter image description here]