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The login command authenticates the user to snapd and the snap store, and saves
credentials into the ~/.snap/auth.json file. Further communication with snapd
will then be made using those credentials.

It's not necessary to log in to interact with snapd. Doing so, however, enables
purchasing of snaps using 'snap buy', as well as some some developer-oriented
features as detailed in the help for the find, install and refresh commands.

An account can be set up at https://login.ubuntu.com