EDI 810 (Invoice) is an X12 transaction set to send billing information for rendered goods and services as per customary and established business and industry practice.

EDI 820 (Payment Order/ Remittance Advice) is an X12 transaction set to make a payment, send remittance advice, or both. EDI 820 can be used as an order or remittance advice sent to the payer to pay the payee directly from a financial institution or a third-party agent.

EDI 850 (Purchase Order) is an X12 transaction set to place a purchase order for goods or services with a vendor as per customary and established business and industry practice.