This plugin is developed to help the ecommerece platform in Pakistan. So they can reduce effort of adding new shipments into tcs and focus into the areas which can really give them benifit in term of revenue.
WooCommerce Tcs Plugin is using thired party soap api which is exposed by tcs to the developers so they can easily integrate their systems with tcs make workflow more handy.
If you are getting error while intializing SoapClient than please check that if soap client is enabled in your php configurations.
To enable soap client on ubuntu.
sudo apt-get install php7.0-soap
sudo apt-get install php7.0-xml
php-config --configure-options --enable-soap