Install the Discounts Backend API

<?php

namespace Pyz\Zed\Discount;

use Spryker\Zed\Discount\DiscountConfig as SprykerDiscountConfig;

class DiscountConfig extends SprykerDiscountConfig
{
    public function isDiscountUuidEnabled(): bool
    {
        return true;
    }
}

<?php

namespace Pyz\Glue\Discount;

use Spryker\Glue\Discount\DiscountConfig as SprykerDiscountConfig;
use Spryker\Shared\DiscountPromotion\DiscountPromotionConfig;

class DiscountConfig extends SprykerDiscountConfig
{
    protected const string ATTRIBUTE_PROMOTION = 'promotion';

    protected const string TRANSFER_PATH_DISCOUNT_PROMOTION = 'discountCalculator.discountPromotion';

    protected const string ATTRIBUTE_PROMOTION_ABSTRACT_SKUS = 'promotion.abstractSkus';

    protected const string ATTRIBUTE_PROMOTION_QUANTITY = 'promotion.quantity';

    /**
     * @uses \Spryker\Zed\DiscountPromotion\Business\Validator\Rule\DiscountPromotion\AbstractSkusDiscountPromotionValidatorRule::ENTITY_IDENTIFIER_ABSTRACT_SKUS
     */
    protected const string ENTITY_IDENTIFIER_PROMOTION_ABSTRACT_SKUS = 'discountCalculator.discountPromotion.abstractSkus';

    /**
     * @uses \Spryker\Zed\DiscountPromotion\Business\Validator\Rule\DiscountPromotion\QuantityDiscountPromotionValidatorRule::ENTITY_IDENTIFIER_QUANTITY
     */
    protected const string ENTITY_IDENTIFIER_PROMOTION_QUANTITY = 'discountCalculator.discountPromotion.quantity';

    /**
     * @return array<string, string>
     */
    public function getTransferPathByAttribute(): array
    {
        return parent::getTransferPathByAttribute() + [
            static::ATTRIBUTE_PROMOTION => static::TRANSFER_PATH_DISCOUNT_PROMOTION,
        ];
    }

    /**
     * @return array<string, string>
     */
    public function getAttributeByEntityIdentifier(): array
    {
        return parent::getAttributeByEntityIdentifier() + [
            static::ENTITY_IDENTIFIER_PROMOTION_ABSTRACT_SKUS => static::ATTRIBUTE_PROMOTION_ABSTRACT_SKUS,
            static::ENTITY_IDENTIFIER_PROMOTION_QUANTITY => static::ATTRIBUTE_PROMOTION_QUANTITY,
        ];
    }

    /**
     * @return array<string, string>
     */
    public function getResponseCodeByErrorMessage(): array
    {
        return parent::getResponseCodeByErrorMessage() + [
            DiscountPromotionConfig::TRANSLATION_KEY_ABSTRACT_SKUS_REQUIRED => static::RESPONSE_CODE_PROMOTION_INVALID,
            DiscountPromotionConfig::TRANSLATION_KEY_QUANTITY_INVALID => static::RESPONSE_CODE_PROMOTION_INVALID,
            DiscountPromotionConfig::TRANSLATION_KEY_ABSTRACT_SKUS_UNKNOWN => static::RESPONSE_CODE_PROMOTION_INVALID,
        ];
    }
}

<?php

namespace Pyz\Zed\Discount;

use Spryker\Zed\Discount\DiscountDependencyProvider as SprykerDiscountDependencyProvider;
use Spryker\Zed\DiscountPromotion\Communication\Plugin\Discount\DiscountPromotionConfigurationOptionsExpanderPlugin;
use Spryker\Zed\DiscountPromotion\Communication\Plugin\Discount\DiscountPromotionDiscountConfiguratorCollectionExpanderPlugin;
use Spryker\Zed\DiscountPromotion\Communication\Plugin\Discount\DiscountPromotionDiscountConfiguratorValidatorRulePlugin;

class DiscountDependencyProvider extends SprykerDiscountDependencyProvider
{
    /**
     * @return array<\Spryker\Zed\DiscountExtension\Dependency\Plugin\DiscountConfigurationOptionsExpanderPluginInterface>
     */
    protected function getDiscountConfigurationOptionsExpanderPlugins(): array
    {
        return [
            new DiscountPromotionConfigurationOptionsExpanderPlugin(),
        ];
    }

    /**
     * @return array<\Spryker\Zed\DiscountExtension\Dependency\Plugin\DiscountConfiguratorValidatorRulePluginInterface>
     */
    protected function getDiscountConfiguratorValidatorRulePlugins(): array
    {
        return [
            new DiscountPromotionDiscountConfiguratorValidatorRulePlugin(),
        ];
    }

    /**
     * @return array<\Spryker\Zed\DiscountExtension\Dependency\Plugin\DiscountConfiguratorCollectionExpanderPluginInterface>
     */
    protected function getDiscountConfiguratorCollectionExpanderPlugins(): array
    {
        return [
            new DiscountPromotionDiscountConfiguratorCollectionExpanderPlugin(),
        ];
    }
}