If you're looking for a guide on how to use multiple Shopify stores with one account, see this guide.
Install the App
Follow these steps:
2. Once you're done, we will fetch your last 30 sales from the last 60 days (a limit defined by Shopify).
3. A Stream notification will be created automatically for you, and your recent sales will then show up on your store.
and the result:
4. You can always edit the notification, change it or add a new type of notification to your store.