How does one go about setting product group bids and ID level bids through the API? We are able to set ad group level bids, but that doesn't change the bids that are set at the product groups and/or ID level, which take precedent over the ad group bids.
As far as I can tell, the ad group bid in shopping seems useless, and we don't seem to be able to set a null value for the product group and ID as we can with keywords on search campaigns.
Our goal was initially to set null bids on ID and Product groups, and automate the overarching ad group bids through the API.
I would love any documentation that you all can provide(I cannot find any on this topic), or any way you all know of to set those bids.
Thanks