I have a web application (React + Node.js) that redirects users to a third-party web app, where they currently need to log in manually. I want to enable automatic login to this third-party web app so users don’t have to log in themselves. I have access to the third-party’s SSO configuration details, such as the ACS URL, SP-init SSO URL, etc.

I’m not very familiar with how SSO and SAML work, so I’m looking for guidance on how to achieve this. Most documentation I find focuses on setting up SSO for my own application, not on handling a third-party’s SSO for automatic user login.

I appreciate any help or guidance you can provide. Thank you!