public String getCallbackId() {
        return this.callbackId;
    }
<p>
The identifier passed to the processor by the service when invoked. Use the identifier to call back the service.
</p>

@return The identifier passed to the processor by the service when invoked. Use the identifier to call back the
        service.
aws-java-sdk-chimesdkmessaging/src/main/java/com/amazonaws/services/chimesdkmessaging/model/ChannelFlowCallbackRequest.java