Everything from Level 2, plus full feedback back into the customer’s P2P/ERP system:

• Order confirmation (acceptance/changes) 
• Delivery/shipping status (e.g., packing slip/ASN, track & trace) 
• Often also: invoice message (e-invoicing) and references (PO number, cost center, etc.) 

Result: one closed process from catalog → order → confirmation → delivery → invoice, fully traceable within the customer’s system.