You must configure your topic in AWS before you can configure it in Stackdriver.
1. Go to https://console.aws.amazon.com/sns/home
2. Select your SNS topic, then click All Topic Actions at the top of the page.
3. Under Publishers, select Only These AWS Users and enter 152022173758. Click Update Policy.
4. Copy the Topic ARN.
**Ensure that you have an SQS queue subscribed to your topic in order to properly receive messages.
1. Head to https://app.stackdriver.com/settings/notifications/sns (or Account>>Account Settings>>Notifications>>SNS)
2. Click the button.
3. Paste your Topic ARN and click Test Connection. You should see "Test notification sent!" in blue letters.