custom-product-page-shortcode.php

<?php
/**
 * Render the latest product in the specified Product Category.
 *
 * @param array $atts The shortcode attributes
 * @return string The formatted HTML
 */
function rhdwp_woo_yayday_latest_bundle_shortcode( $atts ) {
	$product_args = shortcode_atts( array(
		'category'	=> null,
		'title'	=> '',
	), $atts );

	$product_cat = array( esc_attr( $product_args['category'] ) );

	$products = wc_get_products( array(
		'limit'			=> 1,
		'category'	=> $product_cat,
	) );
	
	if ( $products ) {
		$html = '<div class="single-product rhdwp-single-featured-product">';
		
		foreach( $products as $product ) {
			$product_template = do_shortcode( "[product_page id={$product->get_id()}]" );

			$html .= $product_template;
		}
	
		$html .= '</div>';
	}

	return $html;
}
add_shortcode( 'yayday_latest_bundle', 'rhdwp_woo_yayday_latest_bundle_shortcode' );