我可以使用我的expat网络优惠券进行现有订阅吗？
通常，我的expat网络优惠券适用于新用户，并且不能应用于现有订阅。
for most cases, only 1 coupon can be used for each new my expat network subscription. the my expat network checkout page doesn't usually allow more than 1 code to be applied at the same time.