Snippet to change product price to custom declared value and change unit of measurement for international shipping.

functions.php

/* Snippet to change product price to custom declared value and change unit of measurement for international shipping.
Created at : 26 Nov 2018 PluginHive Plugins : https://www.pluginhive.com/plugins/
updated on : 14 Jan 2019 
*/

add_filter( 'wf_ups_shipment_confirm_request_product_details', 'wf_ups_shipment_confirm_request_product_details', 10, 2 );
if( ! function_exists('wf_ups_shipment_confirm_request_product_details') ) {
	function wf_ups_shipment_confirm_request_product_details( $product_details, $product_data ) {
		if(!empty($product_data))
		{
			$product_id=(wp_get_post_parent_id($product_data->get_id())==0) ? $product_data->get_id() : wp_get_post_parent_id($product_data->get_id());
			$custom_declared_value = get_post_meta( $product_id, '_wf_ups_custom_declared_value', true );
			if(!empty($custom_declared_value))
			{
				$product_details['Unit']['Value']=$custom_declared_value;
			}
		}
		$product_details['Unit']['UnitOfMeasurement']['Code']='SET'; // convert U/M to SET
		return $product_details;
	}
}