FNot sure if I get what you want to do. why do you want to build a separat identity system if you already use ZITADEL as an identity system in the background?
FZITADEL is already OAuth compliant and you can generate apps with a client id and a client secret
Fit also provides all the endpoints you need
For is it more about that you want to build your custom login?
FGenerally said, OAuth does involve a lot of things, it depends on what your partners need. https://oauth.net/2/
Fok now i get it, yes that is possible, ZITADEL does an api first approach, this means everything yoyu can manage through our management console you can also manage through an api.
Fwhen creating an application you will get a client id client secret: https://zitadel.com/docs/apis/resources/mgmt/applications
