Invoices and GST
Fill business details and GSTIN on Setup → Settings (Business details).
When GSTIN and GST percent above zero are set, the order page prints a tax invoice with legal name, GSTIN, place of supply, taxable value, and CGST/SGST or IGST as applicable.
Otherwise the page is a bill of supply: seller, buyer, lines, and total without tax breakdown.
Customer-facing order pages show line items, payment and shipping progress, address, and tracking when available.