A billing system is a type of software that helps organisations create and manage invoices. Billing software can also be used to track payments, generate reports, and manage customer accounts, supporting your overall financial planning and management.

Yes, Sage billing software is secure and protects customer and financial data. It’s important to choose billing software that complies with security standards and uses encryption and secure payment processing to protect customer data. 

An invoice and a bill are both payment requests, but they are used in different contexts. An invoice is a fairly detailed document that is sent to a client or customer requesting payment for goods or services that have been delivered. They typically outline payment terms and other details that are needed for accounting and legal purposes, including the date when the payment is expected—for example, within 30 days

A bill is a much simpler request for payment for goods or services. It's usually presented to the customer at the point of sale or shortly after—for example, after a meal in a restaurant. Payment is typically expected immediately or within a much shorter time frame than an invoice.