Add Shipping Address to membership checkout only if Addon Package is included for levels 4, 5, and 9 (for mono618).

hide_pmpro_shipping_level_ID.php

<?php
/**
* Add Shipping Address to membership checkout only if Addon Package is included for levels 4, 5, and 9.
*/
function hide_pmpro_shipping_level_4( $level_id ) {
    if ( ! empty( $_REQUEST['ap'] ) ) {
        $hideshipping = false;
    } else {
        $hideshipping = true;
    }
    return $hideshipping;
}
add_filter( 'pre_option_pmpro_shipping_hidden_level_4', 'hide_pmpro_shipping_level_4' );

function hide_pmpro_shipping_level_5( $level_id ) {
    if ( ! empty( $_REQUEST['ap'] ) ) {
        $hideshipping = false;
    } else {
        $hideshipping = true;
    }
    return $hideshipping;
}
add_filter( 'pre_option_pmpro_shipping_hidden_level_5', 'hide_pmpro_shipping_level_5' );

function hide_pmpro_shipping_level_9( $level_id ) {
    if ( ! empty( $_REQUEST['ap'] ) ) {
        $hideshipping = false;
    } else {
        $hideshipping = true;
    }
    return $hideshipping;
}
add_filter( 'pre_option_pmpro_shipping_hidden_level_9', 'hide_pmpro_shipping_level_9' );