`applicationPlan` seems to have drifted away from its original purpose and implementation. The code now sets a `production` boolean field to `true` on the app create request if `applicationPlan == "paid"`. I'm not sure this `production` flag on the request actually does anything now in CC (I'm checking on that), but if it does then we should think about changing this `String applicationPlan` to a `boolean production`  to match.