public String getClientToken() {
        return this.clientToken;
    }
<p>
Specifies a unique, case-sensitive ID that you provide to ensure the idempotency of the request. This lets you
safely retry the request without accidentally performing the same operation a second time. Passing the same value
to a later call to an operation requires that you also pass the same value for all other parameters. We recommend
that you use a <a href="https://wikipedia.org/wiki/Universally_unique_identifier">UUID type of value.</a>.
</p>
<p>
If you don't provide this value, then Amazon Web Services generates a random one for you.
</p>
<p>
If you retry the operation with the same <code>ClientToken</code>, but with different parameters, the retry fails
with an <code>ConflictException</code> error.
</p>
<p>
Verified Permissions recognizes a <code>ClientToken</code> for eight hours. After eight hours, the next request
with the same parameters performs the operation again regardless of the value of <code>ClientToken</code>.
</p>

@return Specifies a unique, case-sensitive ID that you provide to ensure the idempotency of the request. This
        lets you safely retry the request without accidentally performing the same operation a second time.
        Passing the same value to a later call to an operation requires that you also pass the same value for all
        other parameters. We recommend that you use a <a
        href="https://wikipedia.org/wiki/Universally_unique_identifier">UUID type of value.</a>.</p>
        <p>
        If you don't provide this value, then Amazon Web Services generates a random one for you.
        </p>
        <p>
        If you retry the operation with the same <code>ClientToken</code>, but with different parameters, the
        retry fails with an <code>ConflictException</code> error.
        </p>
        <p>
        Verified Permissions recognizes a <code>ClientToken</code> for eight hours. After eight hours, the next
        request with the same parameters performs the operation again regardless of the value of
        <code>ClientToken</code>.
aws-java-sdk-verifiedpermissions/src/main/java/com/amazonaws/services/verifiedpermissions/model/CreateIdentitySourceRequest.java