Remove province/state code in guest user data while send to Wave

functions.php

<?php
/**
 * Set custom guest user variable for WooCommerce Wave Connector
 * Remove province code in guest user variable.
 *
 * @param array $variable get variable.
 * @param array $order_id get order id.
 * @return array
 */
function venus_wc_custom_guest_user_variable( $variable, $order_id ) {
	unset( $variable['address']['provinceCode'] );
	if ( isset( $variable['shippingDetails']['address']['provinceCode'] ) ) {
		unset( $variable['shippingDetails']['address']['provinceCode'] );
	}
	return $variable;
}
add_action( 'venus_wc_export_guest_customer_variables', 'venus_wc_custom_guest_user_variable', 10, 2 );