The only way to use multiple fingerprints is to save the intent data and use it in your own authenticate. So you can verify it by the activity if the user scan is equal to one of the datas from that user.
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == RESULT_FINISHED) {
finish();
} else {
super.onActivityResult(requestCode, resultCode, data);
}
}
You need to create at the and a userid with multiple scan ids which are valid for the user.