Numpty public charging question

[Flying machine]

I've had my M3 for over a year now but always charged it at home and have never needed used a public charger. Going on a longer journey this week that will need a mid way top up. Do I need to set up any sort of account before I'm out and about needing to use the supercharger network or can I just turn up and start charging and then pay with a card?

See, numpty question!

[Flying machine]

Thank you!