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# Configure the Channel Notification URL

Configure Cloud Pub/Sub so Play Store subscription events are delivered to Zoho Billing through the Channel Notification URL in real time.

**Note:**

Before you begin, check whether a Pub/Sub topic has already been configured for your application. Here’s how:

*   In Google Play Console, go to _Select app > Monetise with Play > Monetisation setup_.
*   Check whether a **Topic** name is already configured for your app.

If a topic is already configured, you can skip creating and linking a new topic and proceed directly to [Configure Topic Permissions](/ca/billing/help/omnichannel-subscription/android/configure-webhook.html#configure-topic-permissions) and [Create a Push Subscription](/ca/billing/help/omnichannel-subscription/android/configure-webhook.html#create-a-push-subscription).

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## Create a Pub/Sub Topic

A Pub/Sub topic is a named channel in Google Cloud that acts as the delivery point for Play Store subscription events. When Google Play sends a lifecycle event (such as a renewal or cancellation), it publishes the event to this topic. A push subscription attached to the topic then forwards that event to Zoho Billing’s Channel Notification URL in real time.

To create a pub/sub topic:

*   Go to Google Cloud Console.
*   Select the project.
*   Open **Pub/Sub**.
*   Go to **Topics**.
*   Click **\+ Create Topic**, enter a **Topic ID** and save.

![create-topic](/billing/images/help/images/omnichannel-subscription/android/create-topic.png)

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## Configure Topic Permissions

Google Play uses a dedicated service account to publish events to your Pub/Sub topic. Without granting it the **Pub/Sub Publisher** role, Google Play cannot write to the topic and no subscription events will be delivered. To configure topic permissions:

*   Go to Google Cloud Console.
*   Select the project and navigate to the topic you created.
*   Open the **Permissions** tab and click **Grant Access**.
*   Add `google-play-developer-notifications@system.gserviceaccount.com`.
*   Grant the **Pub/Sub Publisher** role.

![principal-access](/billing/images/help/images/omnichannel-subscription/android/principal-access.png)

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## Create a Push Subscription

A push subscription tells Google Cloud to actively forward events from the topic to a specified URL as they arrive. Setting the expiration to **Never Expires** ensures delivery continues without interruption after your app goes live.

*   Select the **More** icon on the topic and click **Create Subscription**.
*   Enter a **Subscription ID**.
*   Set **Delivery Type** as **Push**.
*   Paste the **Channel Notification URL** from Zoho Billing into **Endpoint URL**.
*   Set **Subscription Expiration** to **Never Expires**.
*   Click **Create**.

![push-notification](/billing/images/help/images/omnichannel-subscription/android/push-notification.png)

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## Link the Topic in Play Console

This is the step where Google Play is told which Pub/Sub topic to use for your app’s subscription events. Without this link, Play Store will not send any events to your topic. Use **Send Test Notification** to confirm the connection is working before saving.

*   Open your app in Play Console.
*   Go to **Monetisation Setup**.
*   Enter the Pub/Sub topic URL.
*   Click **Send Test Notification** and verify.
*   Click **Save**.

![Play Console Monetisation setup with Pub/Sub topic configured](/billing/images/help/images/omnichannel-subscription/android/play-console-monetisation-setup.png)

Once configured, Play Store lifecycle events are pushed to Zoho Billing through Pub/Sub Topic.

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