Purchaseorder.php

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<?php
namespace Magento\OfflinePayments\Model;

use Magento\Framework\Exception\LocalizedException;

class Purchaseorder extends \Magento\Payment\Model\Method\AbstractMethod
{
    const PAYMENT_METHOD_PURCHASEORDER_CODE = 'purchaseorder';

    protected $_code = self::PAYMENT_METHOD_PURCHASEORDER_CODE;

    protected $_formBlockType = \Magento\OfflinePayments\Block\Form\Purchaseorder::class;

    protected $_infoBlockType = \Magento\OfflinePayments\Block\Info\Purchaseorder::class;

    protected $_isOffline = true;

    public function assignData(\Magento\Framework\DataObject $data)
    {
        $this->getInfoInstance()->setPoNumber($data->getPoNumber());
        return $this;
    }

    public function validate()
    {
        parent::validate();

        if (empty($this->getInfoInstance()->getPoNumber())) {
            throw new LocalizedException(__('Purchase order number is a required field.'));
        }

        return $this;
    }
}