Trying to automate URL inspection in google but cannot get past authentication

Google isn’t clear to me on how I can login to the google search console API.

I’m using PHP and CURL.

I passed in for the URL: "sites/example.com/searchAnalytics/query?key=mykey" and I passed in json parameters for the start and end date. mykey was assigned to me after using google cloud to generate one.

When I execute the curl request through PHP, I receive this error:

"API keys are not supported by this API. Expected OAuth2 access token or other authentication credentials that assert a principal."

Oauth2 wouldn’t be for me because I’m using an private apache server on my computer to handle the requests.

So I looked into google cloud and I’m able to get a unique ID, a client ID and an email ending in iam.gserviceaccount.com

What values do I feed into CURL when making an authenticated request? I would assume I’d place them in as an HTTP header but google is not clear on this.

Please help.

I tried the API key but the google search API wouldn’t allow that as authentication.

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