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Edit File: wck-viewed-product.php

<?php
/**
 * WooCommerceKlaviyo Viewed Product Functions
 *
 * Functions for Viewed Product tracking.
 *
 * @package   WooCommerceKlaviyo
 * @version   2.0.0
 */

// Priority 12 to add after Identify Browser.
add_action( 'wp_enqueue_scripts', 'load_viewed_product', 12 );

/**
 * If on product page, get properties for Viewed Product metric. Enqueue viewed product
 * javascript and pass event data to script.
 */
function load_viewed_product() {
	if ( is_product() ) {
		$product           = wc_get_product();
		$parent_product_id = $product->get_parent_id();
		if ( $product->get_parent_id() === 0 ) {
			$parent_product_id = $product->get_id();
		}

$categories_array = get_the_terms( $product->get_id(), 'product_cat' );
		if ( false === $categories_array ) {
			$categories_array = array();
		}
		$categories = (array) wp_list_pluck( $categories_array, 'name' );

$item = array(
			'title'      => (string) $product->get_name(),
			'product_id' => (int) $parent_product_id,
			'variant_id' => (int) $product->get_id(),
			'url'        => (string) get_permalink( $product->get_id() ),
			'image_url'  => (string) wp_get_attachment_url( get_post_thumbnail_id( $product->get_id() ) ),
			'price'      => (float) $product->get_price(),
			'categories' => $categories,
		);

wp_enqueue_script( 'wck_viewed_product', plugins_url( '/js/wck-viewed-product.js', __FILE__ ), null, WCK_API::VERSION, true );

wp_localize_script( 'wck_viewed_product', 'item', $item );
	}
}

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