What do you sell? e.g. Security Guard, Cleaning Visit, Web Design Retainer.
Service has no stock. Product implies physical good. Bundle is a group/package.
Optional internal reference or stock code. Shown on invoice line if present.
How you bill this item. Hour, Day, Piece, etc. Comes from /api/units.
Tax that applies by default when this item appears on an invoice.
What you usually charge per unit, before tax. You can override per invoice.
Visible on invoice line item. Explain scope or deliverables.