Through our work, we were able to see how the customer service center, as an executive part of the sales department, works closely with all business units, in order to timely receive and send the information necessary for the smooth running of business processes. Operating operations include constant monitoring of customer requirements, and the implementation of second-hand activities from receipt of the order to invoicing. The Customer Service Center receives orders, creates sales orders, creates pro forma invoices, monitors customer payments, connects customer overpayments with sales orders, creates delivery notes, posts delivery notes, monitors customer receivables, monitors product entries and exits for certain operations, conducts customer complaints through the system , sends requests for verification or entry of master data, enters and checks prices and rebates, prepares the reservation of goods for customers, creates returns of goods to the warehouse, and creates orders for financial approvals or charges to customers. Participates in complaints of canceled and sending new invoices through the e-application platform, and constantly cooperates with finance (TRS doo), in order to improve the quality of customer service. Prepares reports for delivered goods, and as we could see through the work quality of transport service.