Explain advanced API composition and Backend-for-Frontend (BFF) architecture in PHP systems.

Backend-for-Frontend architectures create client-specific APIs that aggregate and optimize distributed service communication.

Modern applications serve multiple clients:

Direct microservice exposure creates major problems:

Backend-for-Frontend (BFF) architectures solve this by creating specialized API layers for each client type.

Core responsibilities:

Combine multiple service responses.

Tailor responses per client.

Centralize identity handling.

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