Google mail api subscription steps

 

To create a subscriptionId for Gmail Push Notifications using Google Pub/Sub, follow these steps:

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 Prerequisites:

1. A Google Cloud Project

2. Gmail API and Pub/Sub API enabled

3. A Pub/Sub topic created in the same project

4. A service account with Pub/Sub Publisher and Gmail API permissions

5. Domain-wide delegation enabled (if accessing multiple users)

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🔧 Step-by-Step: Creating a subscriptionId

🔹 Step 1: Create a Pub/Sub Topic

Go to the Google Cloud Console:

• Navigate to Pub/Sub > Topics

• Click "Create Topic"

• Name it: projects/YOUR_PROJECT_ID/topics/YOUR_TOPIC_NAME

🔹 Step 2: Create a Subscription to That Topic

Once your topic is created:

1. Go to Pub/Sub > Subscriptions

2. Click "Create Subscription"

3. Set:

   • Subscription ID: e.g., gmail-updates-sub

   • Topic: Select your topic

   • Delivery Type: Usually Push

   • Endpoint URL: Must be an HTTPS endpoint that can receive Gmail push events (e.g., a webhook)

🔹 Step 3: Grant Gmail Publish Rights

Gmail publishes to Pub/Sub using a special service account:

• Email: gmail-api-push@system.gserviceaccount.com

So, go to IAM > Permissions for your topic and:

• Add a new member: gmail-api-push@system.gserviceaccount.com

• Role: Pub/Sub Publisher

🔹 Step 4: Use subscriptionId in Your App (optional)

While Gmail uses the topic name, you can use the subscription on your server to receive and process messages.

🧪 Testing

You can publish a test message in the Pub/Sub topic, and verify your endpoint (or logging) receives the notification.

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🧠 Notes

• Gmail doesn't use the subscription ID directly. It publishes to the topic, and you subscribe to the topic to receive notifications.

• Your Windows Service should either:

  • Periodically check using HistoryId polling (simpler)

  • OR have a separate HTTP endpoint (like a web server or Azure Function) to receive real-time push

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