• Resolve client billing issues and manage accounts receivable delinquency, ensuring excellent customer service delivery in a timely manner. Clark requires suppliers to receive Purchase Orders and submit Invoices electronically either via Coupa Supplier Portal (CSP) and cXML. Transmission.We are building the best place to work! Provide service to customers and sales partners and facilitate challenge resolution to collect payment. Respond to customer and sales partners inquiries. Click on the 'Waiver Form' link on the bottom of the page. Fill out the form(s) set up for your institution. Apply to Assistant Manager, Customer Service Representative, Production Operator and more! Accounts receivable (AR) is an accounting term for money owed to a business for goods or services that it has delivered but not been paid for yet. Since you speak with customers directly, you require good customer service skills to maintain a good relationship with clients.