I can't. According to the query of Weiduomei official website, Weiduomei vouchers can only be used to buy cakes in Weiduomei official website, and cannot be used together with other vouchers, nor can they be used as membership cards. Weiduomei, a popular bakery in Beijing, is a chain bakery brand under Beijing Weiduomei Food Co., Ltd. Its main products include cakes, bread, coffee, Chinese and western snacks, moon cakes and zongzi.