CouponGenerator.php

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<?php
namespace Magento\SalesRule\Model;

class CouponGenerator
{
    private $keyMap = [
        'quantity' => 'qty'
    ];

    private $couponManagementService;

    private $generationSpecFactory;

    public function __construct(
        \Magento\SalesRule\Model\Service\CouponManagementService $couponManagementService,
        \Magento\SalesRule\Api\Data\CouponGenerationSpecInterfaceFactory $generationSpecFactory
    ) {
        $this->couponManagementService = $couponManagementService;
        $this->generationSpecFactory = $generationSpecFactory;
    }

    public function generateCodes(array $parameters)
    {
        $couponSpecData = $this->convertCouponSpecData($parameters);
        $couponSpec = $this->generationSpecFactory->create(['data' => $couponSpecData]);
        return $this->couponManagementService->generate($couponSpec);
    }

    private function convertCouponSpecData(array $data)
    {
        foreach ($this->keyMap as $mapKey => $mapValue) {
            $data[$mapKey] = isset($data[$mapValue]) ? $data[$mapValue] : null;
        }

        return $data;
    }
}