Hello, there was no body in your post, so I'm not sure if you intended to provide more information with your question. Our API offers a wide range of data that can be retrieved from Constant Contact accounts. The answer to your question depends on on what type of data you would like to get. It sounds vaguely like what you would really like to do is provide a method for syncing local data at two sites with that in your account. It is contact data you are working with?