config/packages/api_platform.yaml

api_platform:
    mapping:
        paths: ['%kernel.project_dir%/src/Entity']
    patch_formats:
        json: ['application/merge-patch+json']
    swagger:
        versions: [3]
        api_keys:
            apiKey:
                name: "Authorization"
                type: "header"

config/routes/api_platform.yaml

api_platform:
    resource: .
    type: api_platform
    prefix: /api