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Subclass BaseAuthentication and implement authenticate(self, request) returning (user, auth) or None.
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to_internal_value runs field-level to_internal_value, then field validators, then validate_<field>, then serializer.validate.
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Override create/update and wrap related saves in transaction.atomic().
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Hyperlinked identities are nice for HATEOAS clients but couple payloads to URL reversing and request context.
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They inspect view serializers, pagination, and authentication to emit OpenAPI.
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