A billing platform is a software system that centralizes and automates the financial workflows associated with charging customers — including invoice creation, payment processing, dunning, tax calculation, and revenue reporting. Unlike basic invoicing tools, billing platforms are designed to support complex pricing models such as usage-based, hybrid, and tiered pricing at scale.

Example: A SaaS company offering both seat-based and API call pricing uses a billing platform to consolidate both streams into a single invoice per customer, apply the correct tax rules by jurisdiction, and automatically retry failed payments — all without manual finance team intervention.