For most tourists, the lowest-risk booking path is: valid home motorcycle license + IDP with motorcycle entitlement + a quick check of the exact listing, checkout flow, booking confirmation, or support thread before pickup.
For most tourists, the low-risk Bali scooter setup is a valid home motorcycle license plus an International Driving Permit (IDP) with motorcycle entitlement. A car-only license is not enough. Before you pay, confirm document acceptance, deposit, damage, and pickup rules in the exact listing, checkout flow, booking confirmation, or support thread, then compare bikes in the rental catalog.