Hi,
Thank you for reaching out to the Google Ads API support team.
Please be informed that as per this
guide, you can set the primary_for_goal attribute of each ConversionAction to indicate the role it should play in bidding and how the action's conversions will
appear in reports. The
include_in_conversions_metric attribute of ConversionAction is deprecated. When managing your conversion actions, set the
primary_for_goal attribute instead, and transition any of your reporting or application logic that relies on include_in_conversions_metric to use primary_for_goal.
If a conversion action's primary_for_goal bit is false, the conversion action is non-biddable for all campaigns regardless of their customer conversion goal or campaign conversion goal. However, custom conversion goals do not respect primary_for_goal, so if a campaign has a custom conversion goal configured with a primary_for_goal = false conversion action, that conversion action is still biddable. By default, primary_for_goal will be true if not set. In V9, primary_for_goal can only be set to false after creation through an 'update' operation because it's not declared as optional.
I hope this helps! Feel free to get back to us in case of any further queries.
