In case you enter a discount code during checkout that doesn't exist or isn't currently active, then you can see the message: “Unable to find a valid discount matching the code entered”.

Normally, one discount code is only applied for one offer. However, If the users put a vast of items in their cart, it is easy to use one coupon code to purchase items. It depends on OnNet's policy, you can contact OnNet via mail for your reference.

Usually, Coupon Stacking is not allowed at OnNet. However, the store will surely give out notice if available.

Shoppers can get coupons for their first purchase at the store. However, it is not all the time, sometimes, they cannot apply a discount on items selling out or items not contained in the promotion program. It depends on the time you shop at OnNet.

Yes. The old coupons from OnNet will be kept on the page if it has not expired. New coupons will continuously be updated.