Access your account from https://live.invoicewizard.io/login
Click on the Templates -> Invoices tab from the left menu.
Scroll down to the Automated PDF Files tab and copy the code.
Open your Shopify admin and click on the “Settings” tab from the left menu.
Click on the “Notifications” section.
Click on the “Order confirmation” template.
You can get more information about Shopify notification templates here: https://help.shopify.com/en/manual/orders/notifications/edit-template
Paste it according to the screenshot below.
As you can see from the screenshot, code is pasted above the {% endcapture %}.
To preview your notification, go to Actions > Preview.
If you’re satisfied with the changes, close the preview window and click Save.
To send the notification as a test email, click Actions > Send test email. The email is sent to the account that you used to log into the Shopify admin.