Make some billing fields optional

pmpro-billing-fields-optional.php

<?php
/**
 * Remove the bstate baddress2 requirement from billing fields generated by PMPro or Address for Free Levels then hide them with CSS
 * Add this code to your site by following this guide - https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */
function my_pmpro_remove_bstate_required( $pmpro_required_billing_fields ){

    //remove field ID's from array to make fields required
    $remove_field = array('bstate,baddress2');

    //loop through the $remove_field array and unset each billing field to make it optional.
    foreach($remove_field as $field){
        unset($pmpro_required_billing_fields[$field]);
		
    }            

    return $pmpro_required_billing_fields;
}

add_filter('pmpro_required_billing_fields', 'my_pmpro_remove_bstate_required', 50 );

// Hide state form field by adding CSS to the page head.
add_action( 'wp_head', 'wp_head_hide_billing_state_field' );
function wp_head_hide_billing_state_field() {
	global $pmpro_pages;
	if ( empty( $pmpro_pages ) || ( ! is_page( $pmpro_pages['checkout'] ) && ! is_page( $pmpro_pages['billing'] ) ) ) {
		return;
	}
	?>
	<style>
		div.pmpro_checkout-field-bstate {
		display: none;
		}
		div.pmpro_checkout-field-baddress2 {
		display: none;
		}
	</style>
	<?php
}