Order processing involves a set of activities between order entry and release to the warehouse. It includes order pattern recognition, credit verification, order status communication and changes, and order batching and assignment for efficient transport and picking. Key aspects of order processing discussed in the document are credit verification, order batching and assignment, order changes and status communication, and order picking technology. Modern customer response systems aim to streamline documentation, invoicing, and collections through electronic orders, transportation documents, and invoices to provide better customer service.