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The Billing Automation skill empowers developers to implement complex subscription lifecycles and recurring payment systems within their applications. It provides standardized patterns for managing billing cycles, generating automated invoices, handling dunning processes for failed payments, and calculating prorated charges for plan upgrades or downgrades. This skill is essential for SaaS applications requiring robust revenue management, tax compliance (VAT/GST/Sales Tax), and seamless subscription state transitions from trial to cancellation.