</span><span class="p">:</span> <span class="kt">String</span><span class="p">,</span>
  <span class="nv">factorSid</span><span class="p">:</span> <span class="kt">String</span><span class="p">,</span>
  <span class="nv">success</span><span class="p">:</span> <span class="kd">@escaping</span> <span class="kt">ChallengeSuccessBlock</span><span class="p">,</span>
  <span class="nv">failure</span><span class="p">:</span> <span class="kd">@escaping</span> <span class="kt">TwilioVerifyErrorBlock</span>
<span cla