Answer: Open-invoice method
Explanation:
The open invoice is one of the type of method that helps in understanding the due payment process in the accounting department in an organization. This method is maintain the customer payment account based on the each invoice issue in the business.
According to the question, the Open-invoice method is used in an organization for the tracking purpose where the consumers paying for the specific products and the services based in the specific sales invoice.
Therefore, Open-invoice method is the correct answer.
