Toll Payment Dublin

[AndroidMan]

I am travelling from Swords to the ferry port (by East Wall).
Google maps is saying that the route has tolls.
Are these toll booths where you can pay cash?
Or is it like the M50 where you have to pay by the following day?
If the latter, can it be done online?

 

[gipimann]

There are toll booths on the port tunnel at the east wall end. This route has variable tolls depending on time of day, so it might be useful to check before travelling.

 

[Leo]

Dublin Port Tunnel has automated and staffed lanes. Private car is €3 off-peak and €10 peak.