public UsernameConfigurationType getUsernameConfiguration() {
        return this.usernameConfiguration;
    }
<p>
Case sensitivity of the username input for the selected sign-in option. For example, when case sensitivity is set
to <code>False</code>, users can sign in using either "username" or "Username". This configuration is immutable
once it has been set. For more information, see <a href=
"https://docs.aws.amazon.com/cognito-user-identity-pools/latest/APIReference/API_UsernameConfigurationType.html"
>UsernameConfigurationType</a>.
</p>

@return Case sensitivity of the username input for the selected sign-in option. For example, when case
        sensitivity is set to <code>False</code>, users can sign in using either "username" or "Username". This
        configuration is immutable once it has been set. For more information, see <a href=
        "https://docs.aws.amazon.com/cognito-user-identity-pools/latest/APIReference/API_UsernameConfigurationType.html"
        >UsernameConfigurationType</a>.
aws-java-sdk-cognitoidp/src/main/java/com/amazonaws/services/cognitoidp/model/UserPoolType.java