I need help with the activity starter

I tried to create a server-like existence using Google Cloud and Googleapi in my Google account and use it as a repository. So I went into Google Cloud and finished setting up oauth and then I tried to test it as a test user. So I went into the website as an activity starter and tried to extract the oauth code on my Google account, but the oauth code is in url, whereas I didn't see the code to extract url in the activity starter setting. Thank you in advance. Thank you very much.

Please show your relevant blocks, and examples of your expected output.