This plugin provides options to allow visitors, admins or shop managers to process invoices on behalf of clients. You can choose to allow visitors, admin or both. These options are important to shops that process payments for their customers over the phone or for clients that forward their invoices to be paid by a third party.
If you are logged in as admin or shop manager, you will seamlessly be logged in as the user and can pay for the order. After payment you can return to the orders admin area by clicking on the link at the bottom of the page. You will be logged back in as yourself. You will be logged back as yourself.
If you are a visitor without an account on the site, you can just pay for the invoice. You have no access to any saved cards or the ability to save a new card.