Successful billing requires adherence to these criteria:
1. Accuracy: The billed sum must precisely match purchased goods or services, including correct pricing, quantities, and taxes.
2. Timeliness: Transactions must be processed swiftly to prevent customer checkout delays.
3. Clear breakdown: The invoice needs to explicitly list individual item costs, taxes, discounts, and the final payable amount.
4. Customer satisfaction: Customers should perceive the billing process as transparent and equitable, free from mistakes or ambiguity.
5. Payment method compatibility: The system must accommodate diverse payment methods (cash, card, mobile) and ensure secure transaction processing.