Auto Script to Access external Server via SFTP using Password and Key

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http://www.unix.com – Hello All, I am stuck! I have access to an external server via SFTP. In order to access the external server I was given a specific port, password, and a ppk. I would to create a script on my server end that can I can setup as a corn job, that will connect to the external server and download what ever is in the folder. Thus far I was able to have a bash script that will automate the log-in process but not include the download of the files. Any help you can provide would be nice. If you can provide an example script or reference links. Thanks a lot in Advance. (HowTos)