equest.</dd>
<dt><strong><code>reason</code></strong></dt>
<dd>The response.</dd>
<dt><strong><code>error</code></strong></dt>
<dd>An exception if exists.</dd>
<dt><strong><code>suggested_status_code</code></strong></dt>
<dd>The recommended HTTP status code for the failure.</dd>
<dt><strong><code>settings</code></strong></dt>
<dd>The settings for Slack OAuth flow.</dd>
<dt><strong><code>default</code></strong></dt>
<dd>The default <code><a title="slack_bolt.oauth.async_callback_options.AsyncCallbackOptions"