About Identity
In Billings, identity refers to the information used to personalize stationery, including estimates, invoices, envelopes, and statements, whether you send those digitally or on paper. You can specify a name and three other lines of information that identify your business, plus a logo.
The first time you open Billings, it looks in your Address Book card (the "Me" card) for basic identity information. You can change that information at any time in the Identity pane of Billings Preferences.
You can use nearly any graphic as your logo, but vector graphics formats, PDF, or Encapsulated PostScript (EPS) work best. The stationery templates that Billings comes with are designed to work with most logos, drawing them at a maximum height of approximately 2/3 inch, or a maximum width of two inches.