Hi Tetiana,
Thanks for reaching out. You could use AdGroupService.GetAdGroup() to fetch bidding strategy data if it exists on the ad group level. You could see different types of the bidding strategies in the AdGroup fields. It is the same for AdGroupCriterionService.GetAdGroupCriterion() and you could check the different types of the bidding strategies in the AdGroupCriterion fields. Please let us know if you have any further questions.
Thanks and regards,
Xiaoming, Google Ads API Team