Navigate to your Shopify store admin panel. 

Right-click on the Store URL and use the "Copy Link Address" option. 

The object here is to get the "[[myshopify]]" URL. 

You can also get the URL in the "Domains" setting further down in the list.

In a new tab,  Navigate to https://admin.portone.cloud/

Click the "Enter Shop Url" field. 
Now paste the Shopify store URL in this input field.

This completes the configuration of Shopify store on PortOne Admin portal

How to set up Shopify on PortOne