Hi Arion,
Thank you for reaching out to us. I see that you're encountering a developer token not approved error. Could you provide me with the account number that you're trying to access? If the account you're trying to access is a production account and not a test account then you will not be able to access that account. To access production accounts, I suggest you apply for
Basic Level Access. For number of impressions and clicks for keywords, you can use the
Keywords Performance Report. You can read more about reporting
here and see
here for an example of reporting. Let me know if you have further questions.
Thank you,
Bryan, Google Ads API Team

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