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 Anker. As the Anker coupon includes your User ID, it cannot be resold or transferred in any way.

Simply, access the Anker site and find your coupons bar. All the latest

coupons will be shown out, note that the coupons bar will only appear when you have coupons available.

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