You currently can use Google Ads API Beta. We recommend to continue running production systems using the AdWords API. While Google Ads API is in “beta”, you may use the new API for testing and development work in preparation for future migration. Please keep in mind that during this "beta" phase, there may be breaking changes in the Google Ads API.
AdWords API can be used to obtain the data fields you've mentioned above. You can also use Google Ads API if you would like.
4. The webpage is not accessible right now.
I tried accessing
this page for Google Ads API and haven't encountered an issue. What error do you encounter with accessing this page? Could you try opening the link in a new Chrome Incognito window?
Let me know if you have further questions.
Thank you,
Bryan, Google Ads API Team

ref:_00D1U1174p._5001UZX3gf:ref