EDI 855 (Purchase Order Acknowledgement) is an X12 transaction set used by sellers to send an acknowledgment to a buyer's purchase order as per customary and established business and industry practice. It can also be used to notify vendor-generated orders, which helps a buyer know if the seller has or will ship the order per pre-agreed terms.

EDI 856 (Shipment/Manifest) is an X12 transaction set to send a list of contents of an order with additional information relating to the shipment. It includes information such as item name, description, characteristics, packaging type, carrier information, and equipment and configurations for the item for transportation. It helps the sender to describe the item and arrange a suitable shipment.

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.

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.