Chapter 23: Multi-Tenant SaaS & Licensing

Multi-tenant software, financial controls, and feature licenses are separate layers: the runtime isolates tenants, the billing system accounts for them, and the entitlement system authorizes use. This chapter connects those layers so that a tenant identity remains trustworthy from request admission through metering and licensed feature access.

• 23.1 Multi-Tenant Architecture: Silo/Pool/Bridge Models, Tenant Isolation, Noisy-Neighbor Mitigation
• 23.2 Billing & Metering: Usage-Based Billing, Invoicing, Dunning, Subscription Lifecycle
• 23.3 Licensing & Entitlements: JWT License Validation, Feature Gating, Entitlement Management
• References