Adding Tracking Details for Advanced Shipment Tracking Plugin From Order Notes

Add this code snippet in functions.php and let me know.

/*
* AST: get UPS Tracking number from order note
* 
*/
add_action( 'woocommerce_rest_insert_order_note', 'action_woocommerce_rest_insert_order_note', 10, 3 );
function action_woocommerce_rest_insert_order_note( $note, $request, $true ) {
    //check if AST is active
    if ( !function_exists( 'ast_insert_tracking_number' ) ) return;
    
    //check if order note is for UPS
    if( strpos( $note->comment_content, '1Z' ) !== false ){
        
        $order_id = $request['order_id'];
        $status_shipped = 1;
        $tracking_number = $note->comment_content;
        $tracking_provider = 'UPS';
        
        ast_insert_tracking_number($order_id, $tracking_number, $tracking_provider, '', $status_shipped );
    }
}

This would normally be off topic, but I happen to have done something very similar recently, so I can share. The way I handled this was to hook into wp_insert_comment (order notes are added as comments), check whether the comment is an order note, and use regex to determine if the note is a tracking number. If it is it gets added using the tracking number function:

add_action(
    'wp_insert_comment',
    function( int $comment_id, WP_Comment $comment ) {
        /**
         * Only order notes will contain shipping information for a product.
         */
        if ( 'order_note' !== $comment->comment_type ) {
            return;
        }

        /**
         * Match note contents to UPS tracking number format.
         * Regex taken from https://www.thetopsites.net/article/53619924.shtml
         */
        preg_match(
            '/b(1Z ?[0-9A-Z]{3} ?[0-9A-Z]{3} ?[0-9A-Z]{2} ?[0-9A-Z]{4} ?[0-9A-Z]{3} ?[0-9A-Z]|[dT]ddd ?dddd ?ddd)b/',
            $comment->comment_content,
            $matches
        );

        /**
         * Abort if the note is not a UPS tracking number.
         */
        if ( empty( $matches ) ) {
            return;
        }

        /**
         * Add tracking details with details number extracted from order note.
         */
        if ( function_exists( 'ast_insert_tracking_number' ) ) {
            ast_insert_tracking_number(
                $comment->comment_post_ID,
                $matches[0],
                'UPS',
                strtotime( $comment->comment_date_gmt ),
                1
            );
        }
    },
    10,
    2
);