Each promotional code is subject to certain redemption conditions, such as a validity period and a minimum order value, cannot be combined with other promotional codes or is only valid for certain items. If the promotional code you have entered is not recognized by the system, check whether your order meets the validity criteria. If the promotional code is rejected again, check that all characters have been entered correctly. For example, you may have entered the letter "o" instead of the number "0" or the letter "I" instead of the number "1". If the code is rejected again, please contact our customer service for assitance.