What is a value-added service layer?
A layer between edge gateways and low-level services that builds and owns core aggregates such as a track or playlist, including visibility and authorization rules. Every BFF asks it for the aggregate instead of re-assembling it from foundational services itself.
Answered in
Backends for Frontends, and What Comes After: Value-Added Services and Domain GatewaysBFFs fix client sprawl, then duplicate authorization logic across themselves. The three-layer fix: edge, value-added services, and per-domain gateways.
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