Head to Settings > Integrations
Install the Shopify App, and login if prompted.
Once installed, click open.
From your roster, choose the artist you are looking to connect a Shopify store to.
Once connected, you will also have the option to import historical orders.
Please note: if you have manually imported any records previous to this import, the system will create duplicate transaction records.
You can search for these fans by filtering for the "shopify" tag in your Fans list.