Bidding method: "auto" or "manual"
Campaign placement: "search", "discovery", or "all"
Optionaldiscovery_Comma-separated location values: "daily_discover", "you_may_also_like"
Optionalenhanced_Enhanced CPC toggle: "true" or "false"
Optionalitem_Product ID (mandatory for manual product selection)
Product selection: "auto" or "manual"
A random string used to prevent duplicate ads
Optionalroas_ROAS target for campaigns with auto bidding
Parameters for the get create product ad budget suggestion API