What do EIPP functions allow buyers to do?

EIPP, or Electronic Invoice Presentment and Payment, functions provide a range of capabilities primarily focused on streamlining the invoicing and payment process between buyers and sellers. The correct response highlights an essential feature of the EIPP system, which is enabling buyers to notify sellers of any issues related to invoices.

Through EIPP, buyers can directly communicate discrepancies or concerns regarding the invoicing, such as incorrect amounts, missing information, or other issues that need to be resolved before a payment can be processed. This function fosters effective communication and ensures that buyers can address issues promptly, which ultimately contributes to smoother transaction processes and better supplier relationships.

While the other choices illustrate various aspects of the purchasing and payment process—making payments, purchasing merchandise, and tracking spending—they do not encapsulate the primary function aimed at improving communication regarding invoice-related issues, which is a critical part of the EIPP system.