SoapClient can be activated on your cPanel/WHM based server with few easy clicks, The SoapClient class offer a client for soap11 servers. In order to activate this Php addon you have to follow these simple steps or you may also refer this video tutorial
Go to Software >> Apache 3
To configure Soap Client login to your WHM account with root credentials, Find Apache 3 in Software section on your Web Host Manager dashboard
Edit Apache Settings
Goto Exhaustive Options List and Enable SoapClient
Now tick this option and click 0n Save and Build option, which going to take couple of minutes to restart your server settings.