A voucher is applied directly to your shopping cart before you finalize your purchase.
You can add the code of your voucher in the field provided for this purpose, in your shopping cart or during the checkout process.
Note that a gift card is different from a coupon - the two fields are therefore differentiated.
It is not possible to cumulate several vouchers and it is not possible to be reimbursed later if you forget to apply it at the time of purchase. Thank you for your understanding.