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”.

Of course not, most coupons may be used only by you when you received them directly from buyee. As the buyee coupon includes your User ID, it cannot be resold or transferred in any way.

It depends! Normally, the percentage that you can save with that buyee Coupon will be shown right on the page, so you can see if it is applied sitewide or not. However, once you are not sure, try it right on their's products you want to buy.

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

Our advice for you to use buyee Coupon effectively is to choose the right day.
Like thousands of other consumers, the time of promotion is when they choose to
shop at buyee, so take advantage of coupons released on those days to save.

Yes. Like all other stores, buyee offers a number of Cyber Monday Coupons. Don't forget to check the expiry date before making your purchase.