Local-only mode. Set up the shared sheet to sync invoices across the team. See Code.gs in your deployment for instructions, then paste the Apps Script web-app URL into the SHEET_ENDPOINT constant at the top of this file's source.
Document details
Parties
Line items
Description
Qty
Unit price
Tax %
Amount
Subtotal$0.00
Tax$0.00
Total$0.00
Payment link — optional
Notes (optional)
Print tip: in the print dialog, set Margins → Default and untick Headers and footers. Tick Background graphics so the payment button colour prints. Pick Save as PDF as the destination.