Example of extending wsclient.

sap

<?php
function sap_soap_menu() {
  $items['sap/getusers'] = array(
    'page callback' => 'sap_soap_users',
    'access arguments' => array('access content'),
    'type' => MENU_NORMAL_ITEM,
  );
  return $items;
}

function sap_soap_users() {
  $parameters = array(
  'Iname' => 'chenx',
  'TAppuser' => array(
    'Mandt' => '700',
    'UserId' => '5094',
    'UserName' => 'chenxh5094',
    'Age' => ''
    ),
  );
  $return = '';
  $service = wsclient_service_load('sap_user_get');
  $result = $service->ZRemotingAppuser($parameters);
  print_r($result);
  foreach($result as $r) {
    foreach ($r->item as $item) {
      $return .= $item->UserName .'<br />';
    }
  }
  //$res = print_r($result);
  return $return;
}
/**
 * Implements hook_wsclient_endpoint_types.
 */
function sap_soap_wsclient_endpoint_types() {
  //die('test');
  return array(
    'tomsoap' => array(
      'label' => t('Tom SOAP'),
      'class' => 'SAPSOAPEndpoint',
    ),
  );
}

/**
 * A remote endpoint type for invoking SOAP services.
 */
class SAPSOAPEndpoint extends WSClientSOAPEndpoint {
  public function client() {
    $this->client = parent::client();
    $this->client->__setLocation('the_correct_address');
    return $this->client;
  }
}