Use the following JCL examples as a guideline for creating your own JCL. Consider storing your user ID and password in a separate concatenated data set. Doing so provides added security because the user ID and password are not directly in the JCL. It is also makes it much easier to change the user ID and password across multiple jobs.
You can use some of the JCL examples as a starting point to traverse a firewall or proxy server. There are very few common characteristics for firewall or proxy servers with local customization. If you are able to traverse the firewall or proxy server with a plain FTP statement, modifications to the parameters USERID, PASSWORD, ACCOUNT, and TARGET_SYS, in conjunction with commands in the FTPCMDS data set, the ftp_data file, or both can permit the z/OS® PDUU to traverse your firewall or proxy server.