public static function update($paymentType, $value)
 {
     Configuration::updateValue(self::bcash . $paymentType, $value);
     $couponId = Configuration::get(self::prefix . self::bcash . $paymentType);
     PaymentDiscount::resetActions($couponId);
     if (!empty($value)) {
         PaymentDiscount::updateReductionPercent($couponId, $value);
         PaymentDiscount::enable($couponId);
     } else {
         PaymentDiscount::updateReductionPercent($couponId, 0);
         PaymentDiscount::disable($couponId);
     }
 }