The reference link is an article and if you have any questions regarding it you can post that as comments here. To add the article gives you the access to the data sheet that explains in detail the integration of Namely with Replicon.
With regards to integrating with TriNet Passport, we would need to gather the use case and the details about what needs to be integrated. We would prefer to discuss this over a quick call if possible. You shall be contacted shortly.
Tony Weber