In order to use a discount code on the app or website, you must enter that code in your cart page in the "discount code" field (or "promo code").
If the code does not work, check the expiration date of your code and the type of product on which it applies.
I want to use several codes / I forgot to indicate my code
You cannot combine several codes at a time. There is only one field to enter your coupon or discount code.
Please note that you cannot change a confirmed order, when they are validated they cannot be modified afterwards. If you forgot to insert your coupon code just use it in your next order!