We are using Exact Target for our email marketing system. We have some batch processes to send our user data to exact target on daily basis. We send data using ET SOAP api. To be specific, we send createRequestDocument object to ET; that document contains subscriber information. The subscribers are either created or updated if the request is successful.
In near future, the data that we will be sending to exact target is going to grow exponentially. We will be sending about 500,000 subscribers to ET almost daily. So, the SOAP API approach is not going to be efficient for that much amount of data.
Question: Is there a way for ET to update data from an FTP file that will be sent daily?