Intricacies of Sending an Invoice

Consider a task as simple as attaching an invoice to an email and sending it to a particular user. It's an incredibly common task, and yet, there are many, many steps involved. What should the invoice look like? How do you programmatically save it as a PDF? How do you attach it to an email? How might you test that the notification was properly sent?If you're interested, come along as I work on this very task for the Laracasts codebase.