Each FTP parameter is just in a string separated by a \n. Example
'privateKeyFile=c:\\somepath\\somekey.ppk\nprivateKeyPassphrase=secret\nfileExist=true'
Example in writeSFTPFile Function call:
qie.writeSFTPFile('host', port, 'path', binary, passive, 'privateKeyFile=c:\\somepath\\somekey.ppk\nprivateKeyPassphrase=secret\nfileExist=true', 'userName', 'password', data);