invoice-generationlisted

# Invoice Generation ## What this does Handles the clerical front end of accounts receivable. It takes the billing inputs for a job or period -- who is being billed, what for, and on what terms -- and drafts a plain, itemized invoice: invoice number, invoice date, due date, line items with quantity and rate, and a total. It never sends the invoice, never marks it paid, and never posts it to an accounting system. A person reviews the draft and sends it. Treat it like a sharp intern drafting the paperwork: fast on the boring parts, always cited, always handed back for a human to check before it goes out the door. ## When to use it - You bill customers for work done, hours logged, or goods delivered and someone currently builds the invoice by hand from a time sheet, order, or contract. - You want the drafting -- numbering, line items, math, due date -- automated but sending the invoice and recording the payment kept human. - Run it per job, per customer, or on a billing-cycle schedule (e.g. end of month). Do not use it to send an invoice, record a payment, or post to an accounting system. It drafts; a human sends. This is the accounts-receivable counterpart to `ap-invoice-processing`, which handles invoices coming in -- this one handles invoices going out. ## Inputs -- how to give it the data Default inputs, no special tooling required: - **The customer.** Name, billing contact, and billing address if you invoice on letterhead. - **The line items.** For each item: descr