AI is reshaping the pricing strategies of software companies, with usage-based and hybrid pricing models becoming more prevalent, necessitating advanced billing infrastructures. Almost 39% of SaaS companies now primarily price based on usage, which demands accurate, flexible, and scalable billing systems that can keep pace with AI's complexity. Unlike traditional SaaS models, AI billing often involves charging for specific usage metrics like tokens, GPU-seconds, or API calls, requiring real-time metering and complex invoicing across multiple currencies and tax regimes. Platforms like Lago provide solutions with features such as event-driven architectures, flexible pricing strategies, automated invoicing, and developer-friendly, API-driven tools, allowing companies to experiment with pricing models rapidly and maintain compliance with global standards. This shift enables companies to align revenue with actual usage, reduce manual billing errors, and support global customer bases while providing developers with the control needed to integrate billing systems seamlessly into existing workflows.