Shopify integration provides a complete picture of your customer's purchases to your customer support team.
1) Goto Manage -> Apps
2) Click on Shopify from the list of apps.
3) Click on Add new button to add a shopify store to mailbox
4 ) Enter your shopify storename and choose Mailbox which you would want to see the shopify widget and click Add.
5) Shopify Widget will be shown on the right sidebar in the conversation window