thConfig object establishes the request and response MessagePolicy objects that are passed to the
 encapsulated modules when they are initialized by the returned ClientAuthContext instance. It is the modules'
 responsibility to enforce these policies when invoked.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>authContextID</code> - An String identifier used to index the provided <i>config</i>, or null. This value must be
 identical to the value returned by the <code>getAuthContex