Redmine

Hi everyone,

I'm a newbie in redmine, I write to ask for support. Specifically, I need to install redmine, and integrate it with a web application. By integration I mean, giving the possibility to users registered on the web application, to access redmine, without having to re-enter the login data, that is, I need them to log in only once (SSO). Is there a plugin that does this? or does redmine have API rests that generate a token and make the user log in automatically?

Thanks to all of you in advance for your support.