curl -X GET https://api.box.com/2.0/folders/4353455/metadata \
     -H 'Authorization: Bearer <ACCESS_TOKEN>'

BoxMetadataTemplateCollection<Dictionary<string, object>> metadataInstances = await client.MetadataManager
    .GetAllFolderMetadataTemplatesAsync(folderId: "11111");

BoxFolder file = new BoxFolder(api, "id");
Iterable<Metadata> metadataList = folder.getAllMetadata();
for (Metadata metadata : metadataList) {
    // Do something with the metadata.
}

folder_metadata = client.folder(folder_id='22222').get_all_metadata()
for instance in folder_metadata:
    if 'foo' in instance:
        print('Metadata instance {0} has value "{1}" for foo'.format(instance['id'], instance['foo']))

client.folders.getAllMetadata('11111')
	.then(metadata => {
		/* metadata -> {
			entries: 
			[ { currentDocumentStage: 'Init',
				'$type': 'documentFlow-452b4c9d-c3ad-4ac7-b1ad-9d5192f2fc5f',
				'$parent': 'folder_11111',
				'$id': '50ba0dba-0f89-4395-b867-3e057c1f6ed9',
				'$version': 4,
				'$typeVersion': 2,
				needsApprovalFrom: 'Smith',
				'$template': 'documentFlow',
				'$scope': 'enterprise_12345' },
				{ '$type': 'productInfo-9d7b6993-b09e-4e52-b197-e42f0ea995b9',
				'$parent': 'folder_11111',
				'$id': '15d1014a-06c2-47ad-9916-014eab456194',
				'$version': 2,
				'$typeVersion': 1,
				skuNumber: 45334223,
				description: 'Watch',
				'$template': 'productInfo',
				'$scope': 'enterprise_12345' },
				{ Popularity: '25',
				'$type': 'properties',
				'$parent': 'folder_11111',
				'$id': 'b6f36cbc-fc7a-4eda-8889-130f350cc057',
				'$version': 0,
				'$typeVersion': 2,
				'$template': 'properties',
				'$scope': 'global' } ],
			limit: 100 }
		*/
	});

client.metadata.list(forFolderId: "22222") { (result: Result<[MetadataObject], BoxSDKError>) in
    guard case let .success(metadata) = result {
        print("Error retrieving metadata")
        return
    }

    print("Retrieved \(metadata.count) metadata instances:")
    for instance in metadata {
        print("- \(instance.template)")
    }
}