This enumerated type is used to indicate how a promotion is selected, if one is added to the email campaign.
Types that use PromotionSelectModeEnum
Calls that use PromotionSelectModeEnum
Automatic mode. The system will select items automatically based on the specified criteria such as price range and selected category.
Manual mode. The user must selects the promotion and adds it in the
promotionId field. This mode can only be used if the user selects the listings included in