Pick where you’re going. Fill in one form for everyone in your group, and a NUM person files each application on the official government site. $9.99 a traveller for eVisas and travel authorizations, $4.99 for free arrival cards, plus the government’s own fee at cost.
Not here? Australia’s ETA is app-only; Türkiye, Saudi Arabia, Ethiopia and others set fees by passport, so NUM links the official site instead. Embassy visas: NUM points you to a visa partner.