Dear Mr/Mrs. XYZ,
(Name of Company) has offered our employees any Twenty Percent discount on all commodities (product/service) purchased through the (cause of discount like Eid/Xmas etc.) season as their way of wishing you all any (occasion name…).
As a way to receive this discount, you must present the employee identification card during the time of purchase. They have also required that you limit the employment of this discount privilege to purchases made a highly effective behalf.
Your cooperation with this matter will be respected. Thank you,