Create an app from the Shopify Dev Dashboard
Copy the Client ID and secret
In WooPOS Setup, Select the Integration tab at the top. If necessary, add a new Shopify integration. Click the “Edit Settings” button.
Input your myshopify.com URL name. Copy and paste the Client ID and Client Secret, and then click Connect. Check the rest of the settings and click Save.
You will then be asked to import products and orders.