フォルダから電子すかしを削除します。
curl -X DELETE https://api.box.com/2.0/folders/4353455/watermark \
-H 'Authorization: Bearer <ACCESS_TOKEN>'
await client.FoldersManager.RemoveWatermarkAsync("22222");
BoxFolder folder = new BoxFolder(api, id);
folder.removeWatermark();
client.folder(folder_id='11111').delete_watermark()
print('The folder watermark was deleted!')
client.folders.removeWatermark('22222')
.then(() => {
// removal succeeded — no value returned
});