public String getClientToken() {
        return this.clientToken;
    }
<p>
Unique, case-sensitive identifier that you provide to ensure the idempotency of the request. Up to 36 letters,
numbers, hyphens, and underscores are allowed.
</p>

@return Unique, case-sensitive identifier that you provide to ensure the idempotency of the request. Up to 36
        letters, numbers, hyphens, and underscores are allowed.
aws-java-sdk-appmesh/src/main/java/com/amazonaws/services/appmesh/model/CreateVirtualServiceRequest.java