FedEx - Change the customs value and commodity description

functions.php

add_filter('wf_fedex_request','wf_fedex_label_request_callback', 10, 2 );
function wf_fedex_label_request_callback($request,$order){

	$custom_products = array(
		'Product-1' => array( //Replace Product-1 with your product name
							'Description' => 'sample descrition for product-1', //Enter prodct description here or keep it blank
							'Amount' => 150.5 //Enter new amount of produt here or keep it blank
						),
		'product2' => array(
							'Description' => 'sample descrition for product-2', 
							'Amount' => 20
						)
	);
	
    $commodities = !empty( $request['RequestedShipment']['CustomsClearanceDetail']['Commodities'] ) ? $request['RequestedShipment']['CustomsClearanceDetail']['Commodities']: array() ;
    
    $total_amount = 0;
	
    foreach ( $commodities as $product_id => $value ) {
		
		if ( array_key_exists( $value['Name'], $custom_products ) ){

			if( !empty($custom_products[$value['Name']]['Description'] ) ){
				$request['RequestedShipment']['CustomsClearanceDetail']['Commodities'][$product_id]['Description'] = $custom_products[$value['Name']]['Description'] ;
			}

			if( !empty($custom_products[$value['Name']]['Amount']) ){
				$request['RequestedShipment']['CustomsClearanceDetail']['Commodities'][$product_id]['UnitPrice']['Amount'] = $custom_products[$value['Name']]['Amount'];
			}
		}

		$total_amount += (float)$request['RequestedShipment']['CustomsClearanceDetail']['Commodities'][$product_id]['UnitPrice']['Amount'];
    }
	
	if( isset( $request['RequestedShipment']['CustomsClearanceDetail']['CustomsValue']['Amount'] ) ){

		$request['RequestedShipment']['CustomsClearanceDetail']['CustomsValue']['Amount'] = $total_amount;
	}

    return $request;
}