Go to https://app.polaranalytics.com/mcp then click on “Connect to Polar Analytics” in the Start data sync tile:

Click “Connect to Polar Analytics” to add the Polar Shopify app to your store:

Click “Install” to add the Polar app to your store:

Shopify will ask you to validate the installation, click on “Install”:

Congrats! You can verify your store is connected by seeing the little “1” next to the Shopify icon, meaning you have 1 active connection to Shopify:
