Snippet to change product description in commercial invoice.

functions.php

/**
 * Snippet to change product description in commercial invoice.
 * Created at : 28 Dec 2018
 * PluginHive Plugins : https://www.pluginhive.com/plugins/
 */
add_filter( 'ph_fedex_commodities','ph_fedex_commodities_description_customization',10,3);
function ph_fedex_commodities_description_customization($commodoties,$request,$fedex_packages) {
    $products=array(
    				array(	'ids'=>array('199','122','789'),
    						'description'=>"put something to showin description"
    					),

    				array(	'ids'=>array('1993','162','489'),
    						'description'=>"put something to showin description"
    					),
    			);
    foreach ($commodoties as $product_id => $product_details) {
    	foreach ($products as $key => $value) {
    		if(in_array($product_id, $value['ids']))
    		{
    			$commodoties[$product_id]['Description']=html_entity_decode( $value['description']);
    		}
    	}
    }
    return $commodoties;
}