you dont need an api key
as I have one . i.e that is used
the station ID is generated on the fly (live)
based on the lat/long and altitude of your station
that is all you need
that is how it works via the api
(and I know it is working as I am able to get the history data back for the data I have sent)
someone might correct me though
there is no place to view your data. i.e like you can with say wunderground
you are just hopefully providing data to help with the models and forecast data and generated current condition data for your lat/long