Order Printer Emailer is a free add-on that we've built for Shopify's Order Printer app. This means that it assumes you already have a Shopify Order Printer "template" of the document you would like your customers to be able to download. There is a free basic invoice/receipt template provided in the app, which you can customize to suit your needs, if needed.
Below is a copy of the variables list found in the Shopify Order Printer app, which this apps templates are compatible with.
