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At the same time, only one discount with the send of the “PROMONAME” parameter is possible for the merchant. If the parameter is sent, but the card does not meet the conditions, the payment will be made for the full amount without a discount.
There can be different discounts for different conditions without sending the “PROMONAME” parameter. If the buyer’s card fits for several discounts at once, then the discount is applied according to the approved rules of the promotion.