As part of the installation of Qlik or Tableau extensions, you will also need to generate SSL certificates for the Linux server(s) you've procured. This is to ensure encrypted traffic from the BI platform/end-user's browser <-> Linux server where the Narrative Science API endpoint sits.
Self-signed certs or fully trusted?
It is possible to start an installation with self-signed certs. However, it is necessary during installation to swap in fully-trusted certificates so that your end users do not need to manually trust the certificates in their browsers.
Your Hosting team, Desktop team, or Security team can support you in getting fully-trusted certificates that establish a chain of trust from the Linux server <-> BI platform/end-user's browser. Those teams can provide you with any intermediate certificates necessary to establish that chain of trust.
Please proceed to the next step: 2.3: Will users be outside your company network?