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 dereklam's policy, you can contact dereklam via mail for your reference.

The sitewide discount from dereklam is applied on certain purchases. For Year-End Deals, the store may have its own requirement to offer you a sitewide discount.

Gift Cards from dereklam are usually offered on major discount days or to loyal customers. If available, it will be shown. Let's check the coupon list.

At the time of updating, dereklam has not applied Student Discount all year round yet. Check the official store and reach out to the customer support team to be clear.