There is an 'Issue Invoice' link from each order. This can be used to view a print version of the invoice for printing if you require a customer be sent a print copy with their order, or by post to request payment. Note that viewing or printing this invoice does not automatically check the 'An invoice for payment has been issued' box. That box must be checked manually by the admin user to confirm that the invoice was sent to the customer.
Customers may view invoices from within their 'My Account' section in a print-ready format so some stores may decide to use this as the primary delivery method for invoices and receipts.
Ensure your page has the following code pasted near the bottom, before the closing 'body' tag.
Copy this code and place it where you want the help icon to appear in your page.
Your help link will appear as the icon below. Click it to verify how the help content will look.
Place a QR code on your product or machinery to let a user easily retrieve the user guide documentation for it.
Right-click and 'copy'