This endpoint represents the deprecated version of the API responsible for promotion tier redemption, and we do not recommend using it. The new Stackable Discounts API introduces additional features and improvements while maintaining backward compatibility, including applying a combination of coupon codes and promotion tiers. Developers are encouraged to migrate to the latest version to take advantage of the latest enhancements and bug fixes. No updates will be provided to the deprecated endpoint.
To verify whether the promotion tier discount can be applied to an order. This method is designed for server side integration which means that it is accessible only through private keys.