Validatevat.php

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<?php
namespace Magento\Customer\Block\Adminhtml\System\Config;

class Validatevat extends \Magento\Config\Block\System\Config\Form\Field
{
    protected $_merchantCountry = 'general_store_information_country_id';

    protected $_merchantVatNumber = 'general_store_information_merchant_vat_number';

    protected $_vatButtonLabel = 'Validate VAT Number';

    public function setMerchantCountryField($countryField)
    {
        $this->_merchantCountry = $countryField;
        return $this;
    }

    public function getMerchantCountryField()
    {
        return $this->_merchantCountry;
    }

    public function setMerchantVatNumberField($vatNumberField)
    {
        $this->_merchantVatNumber = $vatNumberField;
        return $this;
    }

    public function getMerchantVatNumberField()
    {
        return $this->_merchantVatNumber;
    }

    public function setVatButtonLabel($vatButtonLabel)
    {
        $this->_vatButtonLabel = $vatButtonLabel;
        return $this;
    }

    protected function _prepareLayout()
    {
        parent::_prepareLayout();
        if (!$this->getTemplate()) {
            $this->setTemplate('Magento_Customer::system/config/validatevat.phtml');
        }
        return $this;
    }

    public function render(\Magento\Framework\Data\Form\Element\AbstractElement $element)
    {
        $element->unsScope()->unsCanUseWebsiteValue()->unsCanUseDefaultValue();
        return parent::render($element);
    }

    protected function _getElementHtml(\Magento\Framework\Data\Form\Element\AbstractElement $element)
    {
        $originalData = $element->getOriginalData();
        $buttonLabel = !empty($originalData['button_label']) ? $originalData['button_label'] : $this->_vatButtonLabel;
        $this->addData(
            [
                'button_label' => __($buttonLabel),
                'html_id' => $element->getHtmlId(),
                'ajax_url' => $this->_urlBuilder->getUrl('customer/system_config_validatevat/validate'),
            ]
        );

        return $this->_toHtml();
    }
}