Load content on confirmation or checkout page for PMPro.

load-my-script-pmpro.php

<?php
/**
 * Load content for specific pages, checkout or confirmation page
 * Add this code to your PMPro Customizations Plugin - https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */
function load_my_script_for_pmpro() {
	
	global $pmpro_pages;
	if ( is_page( $pmpro_pages['checkout'] ) || is_page( $pmpro_pages['confirmation'] ) ||  is_page( $pmpro_pages['account'] ) ||  is_page( $pmpro_pages['billing'] ) ||  is_page( $pmpro_pages['cancel'] ) ||  is_page( $pmpro_pages['invoice'] ) ||  is_page( $pmpro_pages['levels'] ) ||  is_page( $pmpro_pages['popup-cvv'] ) ) {
	?>
		<!-- script or styles go here -->
	<?php
	}
}
add_action( 'wp_head', 'load_my_script_for_pmpro' );

This recipe is included in the blog post on "Learn how to load JS scripts to the Paid Memberships Pro pages of your membership site." at Paid Memberships Pro here: https://www.paidmembershipspro.com/learn-how-to-load-javascript-scripts-to-the-paid-memberships-pro-pages-of-your-membership-site/