Hi Liva,
Thanks for posting your concern.
Just what the error message is saying, the
DEVELOPER_TOKEN_NOT_APPROVED error will occur when you are using an unapproved developer token to make API calls against production account. You can only use the unapproved and test access developer token to test account in making API calls. If you want to make API calls to a production account, you can request a basic access to your developer token by filling up
this form. The API Compliance team will get back with a response within two business days, once the form is submitted.
Regards,
Ejay
Google Ads API Team

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