Making an organization is simple. You create an account and start inviting people from the Settings panel.
The cost of each user is 7 EUR/month. When creating an organisation, payment is performed by one administrator, meaning that the users you invite don’t need to add a credit card.
If you have, or plan, to establish a CityProbe network, you get one user account and one 3rd party device free of charge for each CityProbe that has an active subscription. In practice you just invite users and add 3rd party devices as normal, and the free users and devices will automatically be discounted from your bill.