final long nodeId = token.getNode().getId();
final long tokenId = token.getId();
final long processVersion = instance.getProcessDefinition().getVersion();
portRef.addExtension(Constants.NODE_ID, String.valueOf(nodeId));
portRef.addExtension(Constants.TOKEN_ID, String.valueOf(tokenId));
portRef.addExtension(Constants.PROCESS_INSTANCE_ID, String.valueOf(instance.getId()));
// Set the counter
String counterName = Constants.PROCESS_NODE_VERSION_COUNTER + nodeId + '_' + tokenId;
portRef.addExtension(counterName, String.valueOf(processVersion));