an> <span class="nv">session</span><span class="p">:</span> <span class="kt"><a href="../Classes/Session.html">Session</a></span><span class="p">,</span> <span class="nv">completion</span><span class="p">:</span> <span class="kd">@escaping</span> <span class="p">(</span><span class="kt">Result</span><span class="o">&lt;</span><span class="kt"><a href="../Protocols/Authenticator.html#/s:9Alamofire13AuthenticatorP10CredentialQa">Credential</a></span><span class="p">,</span> <span class="kt">Error</span><span 