First, go to 'Settings' in the left hand menu bar, then click on 'Webshop settings'. Once you're there, click the button 'Create a webshop link'. You need to fill in your webshop's URL and API keys data.
In this example, we're using a Shopify store. To find its API keys, you need to go to 'Apps' in the left side menu of Shopify and then go to 'Manage private apps' and then add a private app. Your API keys and password will appear. Copy-paste them into the appropriate field in Shopitag and set your VAT rate.
Once these settings have been saved, you can go to 'My products' and click on the button 'From my webshop'. The following prompt will take you through the appropriate steps to add your Shopify product, and you're done once you save everything!