TL;DRThe document that asks a bill-to party for a specific amount for a specific period or event.
An invoice carries the party, the lines, the period each line covers, the amounts, tax, the document number, and the due date. In Sonic it is generated from a schedule or a rated shipment — never typed from scratch.
An invoice moves through draft, final, sent, and paid. Drafts can grow; a sent document cannot.
Where it happens in Sonic
Next
See it on your contracts
A walkthrough on the agreements and files you actually bill from — not a slide deck.