Promo Codes is used as follows: Add new items to your cart and click Place Order. Log in to your account at plazajapan.com or create a new one. You will then be taken to the payment interface, where you can enter the Coupons you obtained at e-coupon-code.com in the [Use Coupon Codes] box. Please note that each Plaza Japan Coupon Codes has its own rules of use, which can be used if your order is eligible.