Promo codes are applied on the number of monthly packs, and not the number of orders. For example, if you have a 50% code, the first pack in your order will be 50% off and the second will be full price. If you have 20% or 25% off your first three boxes, the discount will apply to your two packs in the first order, as well as the third pack in your second order, but not the fourth! If you have any questions regarding this, please feel free to get in touch with us.