Hello Sean,
Thank you for writing to us. Please follow the steps in the upgrading file to migrate from the old ads PHP client library to the new one. If you have already followed this guide and still having trouble making the API request calls, could you please share the complete request and response logs along with the client customer id for me to investigate this further on my end? Please use Reply privately to author option while sharing the details.
Regards,
Nikisha Patel, Google Ads API Team