Are v1 and v2 APIs available when creating an app in our console, using Oauth2.0?

I’m new to the Confluence API so still learning.

I am looking at how to create an app using Oauth 2, to allow API access to my tenancy of Confluence.

When I go to create the app, there seem to be no options to choose which version of the API will be used.

Are both available? Is there any way to only allow one of them to work?

My understanding is that the v1 API can work but via the /ex/ path, not the home site path.

I am looking to test on my personal tenant because we are using Oauth 2 for an app for work, and I’m having trouble understanding why something work and somethings don’t. So I thought I could try some testing in an environment that is fresh.

The v1 API does not work, so I was wondering if that was setting in the app, or if you have to do it another way.