</code> are used to configure the token size (defaults to <code>6</code> characters) and HMAC hash (defaults to <code>&quot;SHA-1&quot;</code>, <code>&quot;SHA-256&quot;</code> and <code>&quot;SHA-512&quot;</code> are available too), respectively.</p></div></div><div class="odoc-spec"><div class="spec value" id="val-verify" class="anchored"><a href="#val-verify" class="anchor"></a><code><span><span class="keyword">val</span> verify : 
  <span>?window:int <span class="arrow">&#45;&gt;</span></span>
  <span>?