Experience Cloud with Customer Account Portal template is the recommended solution to meet the requirements of reducing service costs and improving customer relationship by allowing customers to pay invoices and update their contact information online. Experience Cloud is a product that allows you to create branded online portals for your customers, partners, or employees. Experience Cloud sites can provide self- service resources, such as knowledge articles, FAQs, forums, and case management. Customer Account Portal is a template that provides a pre-built site for customers to access their account information, such as invoices, payments, orders, contracts, or contact details. Customers can also update their profile, preferences, or communication settings from the site. Verified References: Service Cloud Consultant Certification Guide & Tips, Experience Cloud Overview, Customer Account Portal Template Overview