Hi Nunu,
My few cents,
2. https://x.x.x.x/abc/api/axis/Plugin_us_CustomerService?wsdl
is the axis paramter which is beeing mentioned, has any relation if i have to use soap axias adapter?
This means that your endpoint works with AXIS but this doesn't mean that you need to use SOAP (AXIS) adapter, from my experience it is better to avoid to use the AXIS message protocol if you can. The AXIS message protocol is useful for determinated scenarios, for example is you use attachments and you need to convert them to MTOM, to work with Rest services, to work with SOAP 1.2 and so on.
If you decide to work with AXIS in PI, first of all you need to install the libraries, you can check if they are already installed with this URL: http://host:port/XIAxisAdapter/MessageServlet
Hope this helps.
Regards.