In reply to aln:
If you tap one of the icons on the map then the name and description of the charge location should appear at the bottom of your screen. Drag that up and there will be a list of the charging stations there, identified by a five digit number which you will find either on a sticker or written on the side of the unit. If you tap on the right unit on the app you should then get the option to start the charge on the relevant plug/socket.
Bank cards can be used on many of the big DC units, certainly most of the newer ones and I think they are retro fitting it to many older ones too. I don't remember seeing the option on any of the smaller AC units but I could be wrong.
I have a RFID card and find that the simplest way to get charging. My experience of ev charging from the last year has been that it largely works but could definitely be an easier, smoother more intuitive process. I think we are moving from a phase where the user experience was aimed at techy minded people, who were happy with having multiple apps and systems and work-arounds, to the more a mass market phase where hopefully these things are ironed out better.