Yes, why not. You can easily add a discount code in a URL. Here’s an example: http://example.com/produt/?discount=Xmas

In the above link, Xmas is your discount code. This code will work with any URL. Also, the code is then stored so that it does NOT need to remain in the URL to be used at checkout.

Here’s an example of a Discount Code in the admin area:

You can check the link given below for more information:

More information on Discount Codes is available in the general documentation area.

Note: If using this in conjunction with a custom add to cart link, use the & symbol in place of the question mark if the discount code is the last item. Example: http://yoursite.com/?edd_action=add_to_cart&download_id=XXXX&discount=XXXX