Anteriormente estaba usandoesta respuesta para ocultar los campos de pago basados en el método de envío elegido, funcionó bien hasta una actualización (3.4.2 versión actual) Creo que no estoy seguro de qué ha cambiado, pero ya no funciona según lo previsto.

reviamente, cuando se eligió la recolección local, algunos campos se ocultaron y se hicieron opcionales, y cuando se eligió la entrega, volvería a mostrar esos campos de forma dinámica sin volver a cargar la página.

Ahora muestra y oculta los campos según sea necesario, sin embargo, cuando se elige la entrega, muestra los campos correctos marcados como obligatorios pero también tiene el signo (opcional) al lado y lo hace opcional. Vea la imagen a continuación.

Aquí está mi snipper modificado a continuación:

add_filter('woocommerce_default_address_fields', 'custom_default_checkout_fields', 10, 1 );
function custom_default_checkout_fields( $address_fields ) {
$custom_fields = array( 'country', 'address_1', 'address_2', 'state', 'postcode');
foreach($custom_fields as $field)
    $address_fields[$field]['required'] = false;
return $address_fields;
}

add_action( 'wp_footer', 'custom_checkout_field_script' );
function custom_checkout_field_script() {

$pickpoint = 'local_pickup:2';
$free_delivery = 'free_shipping:1';
$flat_rate = 'flat_rate:3';

$required = esc_attr__( 'required', 'woocommerce' );
?>
<script>
    jQuery(function($){

        var shippingMethod = $('input[name^="shipping_method"]:checked'),
            required = '<abbr class="required" title="<?php echo $required; ?>">*</abbr>',
            shippingChecked = $('input#ship-to-different-address-checkbox');

        shippingChecked.change( function(){
            console.log('Shipping Checked: '+shippingChecked.prop('checked'));
        });

        function showHide( actionToDo='show', selector='' ){
            if( actionToDo == 'show' )
                $(selector).show(function(){
                    $(this).addClass("validate-required");
                    $(this).removeClass("woocommerce-validated");
                    $(this).removeClass("woocommerce-invalid woocommerce-invalid-required-field");
                    if( $(selector+' > label > abbr').html() == undefined )
                        $(selector+' label').append(required);
                });
            else
                $(selector).hide(function(){
                    $(this).removeClass("validate-required");
                    $(this).removeClass("woocommerce-validated");
                    $(this).removeClass("woocommerce-invalid woocommerce-invalid-required-field");
                    if( $(selector+' > label > abbr').html() != undefined )
                        $(selector+' label > .required').remove();
                });
        }

        if( shippingMethod.val() == '<?php echo $pickpoint; ?>' )
        {
            showHide('show','#billing_country_field' );
            showHide('hide','#billing_address_1_field' );
            showHide('hide','#billing_address_2_field' );
            showHide('hide','#billing_postcode_field' );
            showHide('hide','#billing_state_field' );
        }
        else if( shippingMethod.val() == '<?php echo $free_delivery; ?>' || '<?php echo $flat_rate; ?>')
        {
            showHide('show','#billing_address_1_field');
            showHide('show','#billing_address_2_field');
            showHide('show','#billing_postcode_field');
            showHide('hide','#billing_state_field');
            showHide('hide','#billing_country_field');
        }

        $( 'form.checkout' ).on( 'change', 'input[name^="shipping_method"]', function() {
            var shipMethod = $('input[name^="shipping_method"]:checked');
            if( shipMethod.val() == '<?php echo $pickpoint; ?>' )
            {
                showHide('show','#billing_country_field');
                showHide('hide','#billing_address_1_field');
                showHide('hide','#billing_address_2_field');
                showHide('hide','#billing_postcode_field');
                showHide('hide','#billing_state_field');
            }
            else if( shipMethod.val() == '<?php echo $free_delivery; ?>' || '<?php echo $flat_rate; ?>')
            {
                showHide('show','#billing_address_1_field');
                showHide('show','#billing_address_2_field');
               showHide('show','#billing_postcode_field');
                showHide('hide','#billing_state_field');
                showHide('hide','#billing_country_field');
            }
            else
            {
                showHide('show','#billing_address_1_field');
                showHide('show','#billing_address_2_field');
                showHide('show','#billing_postcode_field');
                showHide('show','#billing_state_field');
                showHide('show','#billing_country_field');
            }
        });

        $( 'input#ship-to-different-address-checkbox' ).click( function() {
            var shipMethod = $('input[name^="shipping_method"]:checked');
            if( shipMethod.val() == '<?php echo $pickpoint; ?>' && shippingChecked.prop('checked') == true )
            {
                showHide('show','#billing_country_field');
                showHide('hide','#billing_address_1_field');
                showHide('hide','#billing_address_2_field');
                showHide('hide','#billing_postcode_field');
                showHide('hide','#billing_state_field');

                showHide('show','#shipping_country_field');
                showHide('hide','#shipping_address_1_field');
                showHide('hide','#shipping_address_2_field');
                showHide('hide','#shipping_postcode_field');
                showHide('hide','#shipping_state_field');
            }
            else if( shipMethod.val() == '<?php echo $free_delivery; ?>' || '<?php echo $flat_rate; ?>' && shippingChecked.prop('checked') == true )
            {
                showHide('show','#billing_address_1_field');
                showHide('show','#billing_address_2_field');
                showHide('show','#billing_postcode_field');
                showHide('hide','#billing_state_field');
                showHide('hide','#billing_country_field');

                showHide('show','#shipping_address_1_field');
                showHide('show','#shipping_address_2_field');
                showHide('show','#shipping_postcode_field');
                showHide('hide','#shipping_state_field');
                showHide('hide','#shipping_country_field');
            }
            else if( shippingChecked.prop('checked') == false )
            {
                showHide('show','#shipping_address_1_field');
                showHide('show','#shipping_address_2_field');
                showHide('hide','#shipping_state_field');
                showHide('hide','#shipping_country_field');
            }
        });
    });
</script>
<?php
}

¡Cualquier puntero sería muy apreciado!