Invoice.php

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<?php
namespace Magento\Sales\Block\Adminhtml;

class Invoice extends \Magento\Backend\Block\Widget\Grid\Container
{
    protected function _construct()
    {
        $this->_controller = 'adminhtml_invoice';
        $this->_blockGroup = 'Magento_Sales';
        $this->_headerText = __('Invoices');
        parent::_construct();
        $this->buttonList->remove('add');
    }

    public function getPaymentInfoHtml()
    {
        return $this->getChildHtml('payment_info');
    }
}