Factory.php

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<?php
namespace Magento\Payment\Model\Method\Specification;

use Magento\Framework\ObjectManagerInterface;
use Magento\Payment\Model\Method\SpecificationInterface;

class Factory
{
    protected $objectManager;

    public function __construct(ObjectManagerInterface $objectManager)
    {
        $this->objectManager = $objectManager;
    }

    public function create($specificationClass)
    {
        $specification = $this->objectManager->get($specificationClass);
        if (!$specification instanceof SpecificationInterface) {
            throw new \InvalidArgumentException('Specification must implement SpecificationInterface');
        }
        return $specification;
    }
}