Now If you have successfully setup the SimpleSAMLPHP as a service provider, you should be to download the service provider metadata. You get the list of configured SPs in SimpleSAMLPHP by browsing to the following link.

https://mysp.mycompany.com/simplesaml/module.php/core/frontpage_federation.php

There if you can successfully download the metadata for your SP (usually named 'default-sp') you should be all set to go on to then next step.