RTDN
Real-Time Developer Notifications — Google Play's push notification system that tells your backend about subscription lifecycle events as they happen.
Definition
RTDN (Real-Time Developer Notifications) is Google Cloud Pub/Sub topic that Google Play pushes messages to when subscription events occur — renewals, cancellations, expiries, grace period starts, account hold, and more. Instead of polling the Google Play Developer API to check subscription state, you subscribe to Pub/Sub and receive events in near real time.
RTDN is essential for accurate subscription management. Without it, you would not know a subscription was cancelled until the next time the user opens your app. With RTDN, your backend is notified within seconds, and can update entitlement state immediately.
Examples
- A user cancels their monthly subscription on Google Play. Within seconds, Pub/Sub delivers a SUBSCRIPTION_CANCELED RTDN event to Tierux, which marks the entitlement as cancelled and schedules expiry at the period-end date.
- A renewal payment fails and the subscription enters a grace period. The RTDN event triggers a grace-period state, giving the user time to fix their payment method before losing access.
- Tierux processes RTDN events automatically — you configure the Pub/Sub topic once during setup (your AI agent does it), and all subsequent events are handled without any code changes.
Purchase token
Each RTDN event carries a purchase token that identifies the affected subscription.
Server-side receipt validation
RTDN events complement server-side validation by keeping subscription state fresh between user-triggered checks.
MRR
RTDN events feed directly into MRR calculations — accurately tracking renewals and cancellations in real time.
Real-time subscription events, zero polling
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