TIB Custom provider configuration - help

Thanks Martin. Basically what I’m trying to achieve is something described by this article:

I think what I’m confused is how in #1, the “External Party” pass can reach the “the Identity Providers”. It looks like the ‘Authenticate’ call will just be another API that is registered into tyk gateway of which request will be proxied to the Identity Providers. I do not believe when it is referring to TIB in particular, correct me if I’m wrong.