Authorize.net is a payment gateway provider that enables merchants to accept credit card and electronic cheque payments through their website and mobile applications. The service is designed to help merchants process transactions securely and efficiently, manage customer data and prevent fraud. Authorize.net provides merchants with a virtual terminal that allows them to manually enter credit card information and process payments from any computer with Internet access. It also provides APIs (Application Programming Interface) for merchants to integrate their website and mobile applications with the service, allowing them to securely transfer sensitive customer data. Authorize.net also offers a range of security features, such as fraud detection and prevention tools, as well as compliance with various industry standards and regulations, such as PCI DSS. Overall, Authorize.net is a reliable and widely used service that helps merchants accept payments securely and efficiently.