What is an invoice primarily used for in business?

An invoice is primarily used to request payment for goods or services provided to a customer. It serves as a formal document that outlines what was delivered, including details such as the quantity, description, unit price, and total amount due. Additionally, it may include payment terms, the due date, and instructions on how to make payments.

This function is critical for the financial operations of a business, as it helps track sales, manage cash flow, and facilitate the collection of payments. The creation and distribution of invoices are also vital to maintaining accurate financial records and ensuring that both the seller and buyer have a clear agreement on the transaction.

The other options represent different functions in business operations but do not accurately capture the primary purpose of an invoice. Acknowledging receipt of a purchase order is typically managed with a confirmation rather than an invoice. A sales catalog is aimed at marketing products and providing potential customers with information about offerings, rather than directly addressing payment. Summarizing membership details relates more to membership management and engagement rather than the transactional nature of an invoice.