Unattended auto-login

I have a web application that is not designed using Ignition. The client will log in to this separate web application using credentials. I need to display, inside of this separate web application, the Ignition dashboard for that same client. Does Ignition have a feature to allow me to pass login credentials, or a token, from my separate web application, to effect logging in to the Ignition dashboard?

If the separate web application uses an IdP (Identity Provider) that supports OpenID Connect (OAuth) or SAML, you can probably get it to pass those same credentials to Ignition. If not, I don't know if there's any other way to do it.