From the next version you will be able to create unlimited coupon codes in Midrub. You will be able to decide if a coupon can be used once or multiple times. Each coupon code will be unique and you will decide the discount value(up to 99%).
You can delete the coupon codes but you can’t edit the discount value(the solution is to delete and create a new discount code).
In the video bellow you can watch how to create and use the coupon codes in Midrub: