A digital billing system is a method that companies use to collect payments through electronic means such as by using the internet, dial access and automated teller machines. It has become a central component of online banking services and other financial service providers. Other companies with large customer bases, such as utilities, insurers and telecommunications companies, also rely on these types of payment systems to provide efficiency and ease of use to their customers.

These payment systems are generally one of two types: direct billing and bank aggregator. In the first, the company providing the goods or services gives customers the option to make their payment through a web site and often alerts them when a payment is due using email. The customer logs into their site and makes the payment. In the bank aggregator method, customers are able to pay bills for a range of different companies through a portal in which the service collects the payments and distributes them to the relevant company.