Overview
Direct expense endpoints mounted at /expenses.
Quantities and units
Expense line items follow the same quantity and unit rules as bill line items: quantity accepts fractional values to 4 decimal places, and unit is an optional label of at most 50 characters. A line tied to an inventory item through sku takes the item’s selling unit unless a different unit is sent, and needs a whole-number quantity when that unit is EACH.
Line items in expense responses return quantity as a number, unit when the line has one, and the sku of the inventory item the line is tied to.
Money values come back as decimal strings: rate, amount and vat on line items, and value and amount on adjustments. Requests send them as numbers.

