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.
This endpoint supports the validation of a single promotion tier. If you need to validate more than one incentive, you can use the Stackable discounts API. The stacking discounts API lets you validate up to 5 incentives per call. Before integrating Voucherify, choose which validation endpoint you prefer to use.