public void setClientToken(String clientToken) {
        this.clientToken = clientToken;
    }
<p>
Custom string that can be used to distinguish between calls to the <a
href="https://docs.aws.amazon.com/C4SCEP_API/pca-connector-scep/latest/APIReference/API_CreateChallenge.html"
>CreateChallenge</a> action. Client tokens for <code>CreateChallenge</code> time out after five minutes.
Therefore, if you call <code>CreateChallenge</code> multiple times with the same client token within five
minutes, Connector for SCEP recognizes that you are requesting only one challenge and will only respond with one.
If you change the client token for each call, Connector for SCEP recognizes that you are requesting multiple
challenge passwords.
</p>

@param clientToken
       Custom string that can be used to distinguish between calls to the <a href=
       "https://docs.aws.amazon.com/C4SCEP_API/pca-connector-scep/latest/APIReference/API_CreateChallenge.html"
       >CreateChallenge</a> action. Client tokens for <code>CreateChallenge</code> time out after five minutes.
       Therefore, if you call <code>CreateChallenge</code> multiple times with the same client token within five
       minutes, Connector for SCEP recognizes that you are requesting only one challenge and will only respond
       with one. If you change the client token for each call, Connector for SCEP recognizes that you are
       requesting multiple challenge passwords.
aws-java-sdk-pcaconnectorscep/src/main/java/com/amazonaws/services/pcaconnectorscep/model/CreateConnectorRequest.java