Which model of the smartthings hub do you have? You should be able to use either Z wave or zigbee, But the zigbee options will require A custom device type handler. The Z wave options should typically work straight out of the box. (Also, the Z wave options should be available from Amazon. I’m not sure if the zigbee option is.)
Take a look at the following FAQ and see if it helps clear up the choices. (This is a clickable link)