Create Custom Primary Contact Information Fields if Cart contains Virtual Products @ WooCommerce Checkout

functions.php

add_action( 'woocommerce_after_checkout_billing_form', 'primary_contact_fields' );
function primary_contact_fields( $checkout ){
if( is_virtual() ) {
	echo '</div>';
	echo '<div class="woocommerce-primary_contact-fields" style="float:left;">';
	echo '<h3>Primary Contact Information</h3>';
	echo '<div class="woocommerce-primary_contact-fields__field-wrapper">';
	woocommerce_form_field( 'primarycontactname', array(
		'type'          => 'text', // text, textarea, select, radio, checkbox, password, about custom validation a little later
		'required'		=> true, // actually this parameter just adds "*" to the field
		'class'         => array('primary-contact-name-class', 'form-row-wide'), // array only, read more about classes and styling in the previous step
		'label'         => 'Contact Name',
		'label_class'   => 'primary-contact-name-label', // sometimes you need to customize labels, both string and arrays are supported
		), 
	$checkout->get_value( 'primarycontactname' ) );
	woocommerce_form_field( 'primarycontactphone', array(
		'type'          => 'text', // text, textarea, select, radio, checkbox, password, about custom validation a little later
		'required'		=> true, // actually this parameter just adds "*" to the field
		'class'         => array('primary-contact-name-class', 'form-row-wide'), // array only, read more about classes and styling in the previous step
		'label'         => 'Contact Phone',
		'label_class'   => 'primary-contact-phone-label', // sometimes you need to customize labels, both string and arrays are supported
		), 
	$checkout->get_value( 'primarycontactphone' ) );
	woocommerce_form_field( 'primarycontactemail', array(
		'type'          => 'email', // text, textarea, select, radio, checkbox, password, about custom validation a little later
		'required'		=> true, // actually this parameter just adds "*" to the field
		'class'         => array('primary-contact-email-class', 'form-row-wide'), // array only, read more about classes and styling in the previous step
		'label'         => 'Contact Email',
		'validate'      => 'validate-email',
		'label_class'   => 'primary-contact-email-label', // sometimes you need to customize labels, both string and arrays are supported
		), 
	$checkout->get_value( 'primarycontactemail' ) );
	echo '</div>';
	}
}
function is_virtual(){
	foreach ( WC()->cart->get_cart() as $cart_item_key => $cart_item ) {  
		if ( $cart_item['data']->is_virtual() ){
			return true;
		}	
	} return false;
}