Adds a PMPro Level Checkout button to the checkout page

Insert PMPro Level Button

<?php // do not include in Customizations plugin
/**
 * Add PMPro Level Checkout button to checkout page.
 *
 * Add this code to a PMPro customization plugin.
 *
 */

add_action( 'pmpro_checkout_after_level_cost', 'insert_pmpro_level_button' );
function insert_pmpro_level_button() {
    echo 'Level 2 => ' . do_shortcode( '[pmpro_checkout_button level="2"]' );
    echo ' | ';
    echo 'Level 3 => ' . do_shortcode( '[pmpro_checkout_button level="3"]' );
}