Siteline supports Single Sign On via a SAML Identity Provider. We provide instructions for Microsoft Azure, but this should apply to any SAML identity provider.
At a high level, we need 2 SAML apps (Siteline Prod and Siteline Staging) as well as a test account which can be removed once testing is done.
To create an enterprise application on Azure (which you'll need to do twice), please follow the "Enable single sign-on" section in this Azure how-to guide.
How to get started
Complete and submit the following form to Siteline: https://tally.so/r/nWo8OP
Note that we need 1-2 business days to test and deploy the authentication flow after we receive your credentials.