magento-test/app/code/Magento/InstantPurchase/view/frontend/templates/button.phtml

<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */

/** @var \Magento\InstantPurchase\Block\Button $block */
?>

<?php if ($block->isEnabled()) : ?>
<div id="instant-purchase" data-bind="scope:'instant-purchase'">
    <!-- ko template: getTemplate() --><!-- /ko -->
</div>
<script type="text/x-magento-init">
    {
        "#instant-purchase": {
            "Magento_Ui/js/core/app": <?= /* @noEscape */ $block->getJsLayout();?>
        }
    }
</script>
<?php endif; ?>