When you need to print invoices for your Shopify sales, there are a few ways to go about it. You can have a text editor template ready, fill it out every time and print or you can have a pdf template ready and fill it out by hand after printing it for every order you ship out. Another, more professional way, is to use a Shopify invoice generator software that does it all automatically. A good example of this would be Multiorders, which automatically generates your Shopify invoices and does much more for your business.