how to add soap in CodeIgniter 4?

it mentions : composer require econea/nusoap

so if you started with CI4 app starter i.e  composer create-project codeigniter4/appstarter project-root

then you can either cd into root and use command : require econea/nusoap

or edit composer.json and then compose install

thats the firs step ; then you need to see if classes have name spaces or not

i need to sample code for this description