SaaS billing workflow software is essential for managing complexities in SaaS billing, such as multiple payment plans and add-ons. This cloud-based technology automates billing processes, tracks customer spending, integrates analytics, and enhances security. Key features to look for include customizable onboarding, built-in analytics, fraud prevention, subscription management, and dunning management. Signs that indicate the need for SaaS billing workflow software include starting a SaaS business, high customer churn, lack of industry trend awareness, and the need for flexible billing models.