{"customer_name": "Customer full name", "invoice_number": "Invoice identifier", "amount_due": "Original amount", "due_date": "Original due date", "days_overdue": "Number of days overdue", "late_fees": "Accumulated late fees", "collection_fees": "Collection fees", "total_with_fees": "Total including all fees", "final_deadline": "Deadline before collections", "collection_agency": "Collection agency name", "currency_symbol": "Currency symbol", "payment_link": "URL to payment page", "company_name": "Your company name", "company_phone": "Your phone number", "company_email": "Your email", "tracking_pixel_url": "Open tracking pixel"}