Hi,
Thank you for reaching out. It is not possible to get the SPENT COST from Adgroup Performance Report or adgroup resource. Let us know if you need additional information.
Regards,
Nikisha Patel, Google Ads API Team
Hi,
You could get the Cost and Cost Per Conversion details from Adgroup Performance Report in Adwords API. Also, you could refer to the migration guide for equivalent of Adgroup Performance Report in Google Ads API for getting these details. Let us know if you need additional details.
Regards,
Nikisha Patel, Google Ads API Team