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Editing: external.php

<?php
/**
 * External product add to cart
 *
 * This template can be overridden by copying it to yourtheme/woocommerce/single-product/add-to-cart/external.php.
 *
 * HOWEVER, on occasion WooCommerce will need to update template files and you
 * (the theme developer) will need to copy the new files to your theme to
 * maintain compatibility. We try to do this as little as possible, but it does
 * happen. When this occurs the version of the template file will be bumped and
 * the readme will list any important changes.
 *
 * @see https://docs.woocommerce.com/document/template-structure/
 * @package WooCommerce\Templates
 * @version 3.4.0
 */

defined( 'ABSPATH' ) || exit;

do_action( 'woocommerce_before_add_to_cart_form' ); ?>

<form class="cart" action="<?php echo esc_url( $product_url ); ?>" method="get">
	<?php do_action( 'woocommerce_before_add_to_cart_button' ); ?>

<?php wc_query_string_form_fields( $product_url ); ?>

<?php do_action( 'woocommerce_after_add_to_cart_button' ); ?>
</form>

<?php do_action( 'woocommerce_after_add_to_cart_form' ); ?>

[ CANCEL ]

Name	Type	Actions
.. (Parent Directory)
📄 external.php	FILE	[EDIT]
📄 grouped.php	FILE	[EDIT]
📄 simple.php	FILE	[EDIT]
📄 variable.php	FILE	[EDIT]
📄 variation-add-to-cart-button.php	FILE	[EDIT]
📄 variation.php	FILE	[EDIT]

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Editing: external.php