Placeholder Description Example Output {invoice_number} Unique invoice identifier INV-2026-001234 {invoice_date} Date invoice was created February 25, 2026 {due_date} Payment due date March 10, 2026 {invoice_amount} Total invoice amount with currency $1,500.00 {invoice_total} Numeric total amount only 1500.00 {currency} Currency code or symbol USD or $ {invoice_url} Direct link to invoice view page https://example.com/invoices/INV-2026-001234 {payment_link} Direct link to payment form https://example.com/pay/invoice/token123