There are several options to deliver an invoice to your customer.
The traditional method is delivery by post. An invoice is printed and packaged in an envelope, a stamp is affixed and the envelope is mailed to the recipient. This is the most time consuming and expensive invoice delivery method; the recipient can only handle such an invoice by hand.
Electronic delivery method. An invoice is sent to the recipient at a specified e-mail or left in any cloud service or personal cabinet, where the recipient can retrieve it. This is a quick and most importantly, free method of invoice delivery. Not only can the recipient enter such an invoice manually, they can also process it by copying the data and then pasting it into the fields in the document creation form.
A direct link to the invoice. In this way the recipient can follow a link to see, save,...