Add a user field to the invoice page

add_user_fields_to_pmpro_invoice.php

<?php
/**
 * This recipe adds a user field to the invoice page.
 *
 * You can add this recipe to your site by creating a custom plugin
 * or using the Code Snippets plugin available for free in the WordPress repository.
 * Read this companion article for step-by-step directions on either method.
 * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */

function add_user_fields_to_pmpro_invoice() {
	global $current_user;

	$field_value = get_user_meta( $current_user->ID, 'your_field_name', true );

	echo '<li><strong>Your field:</strong> ' . $field_value . '</li>';

}
add_action( 'pmpro_invoice_bullets_bottom', 'add_user_fields_to_pmpro_invoice' );