<note> <p>This is <b>AWS WAF Classic</b> documentation. For more information, see <a href="https://docs.aws.amazon.com/waf/latest/developerguide/classic-waf-chapter.html">AWS WAF Classic</a> in the developer guide.</p> <p> <b>For the latest version of AWS WAF</b>, use the AWS WAFV2 API and see the <a href="https://docs.aws.amazon.com/waf/latest/developerguide/waf-chapter.html">AWS WAF Developer Guide</a>. With the latest version, AWS WAF has a single set of endpoints for regional and global use. </p> </note> <p>When you want to create, update, or delete AWS WAF objects, get a change token and include the change token in the create, update, or delete request. Change tokens ensure that your application doesn't submit conflicting requests to AWS WAF.</p> <p>Each create, update, or delete request must use a unique change token. If your application submits a <code>GetChangeToken</code> request and then submits a second <code>GetChangeToken</code> request before submitting a create, update, or delete request, the second <code>GetChangeToken</code> request returns the same value as the first <code>GetChangeToken</code> request.</p> <p>When you use a change token in a create, update, or delete request, the status of the change token changes to <code>PENDING</code>, which indicates that AWS WAF is propagating the change to all AWS WAF servers. Use <code>GetChangeTokenStatus</code> to determine the status of your change token.</p>