I have a WooCommerce Order Notification SMS plugin. It sends automatic order updates by SMS (using Teleo SMS API). It is working fine for now. It is very small plugin with only 3 php files. It was updated a year ago.
So, I want you to check and do any required code updates and
1) Do any updates (if any) for compatibility with latest versions of wordpress & woocommerce.
2) Check and fix any code errors.
3) Remove any unnecessary code.