Haneda Airport has three terminals:
Terminal 1 is for domestic flights only. Terminal 2 serves domestic and international flights. Terminal 3 is for international flights only.
Terminal 1 (domestic only)
Terminal 2 (domestic and international)
Terminal 3 (international only)
Terminals are connected by free shuttle bus service.
Free shuttle buses stop on the ground level in front of each terminal.
You can walk between Terminals 1 and Terminal 2 in several minutes
The Terminal 3 is far from Terminal 1 and Terminal 2, so you need to take the free shuttle bus.
You can buy a PASMO (prepaid IC card) from a Keikyu Line ticket machine.
Tokyo Monorail stations
Tokyo Monorail Line has three stations at Haneda Airport:
"Haneda Airport Terminal 1" Station
"Haneda Airport Terminal 2" Station
"Haneda Airport Terminal 3" Station (called 'Haneda Airport International Terminal' station until 14 March 2020)
Unlike Keikyu Line, Monorail Line has a station at each of three terminals.
You can also buy a 'Monorail SUICA (prepaid IC card)' from a ticket machine at any Keikyu station at Haneda airport.
Monorail SUICA is 100% compatible with SUICA and PASMO, but you can get a deposit refund only at some Monorail stations for a fee.