This is not provided in theirs API, but after some digging into the libraries i figured it out.
Make a POST to: https://api.soundcloud.com/oauth2/token
with these params
grant_type=password&client_id=YOUR_CLIENT_ID&client_secret=YOUR_SECRET_ID&username=USERNAME&password=PASSWORD&scope=non-expiring
this will return non expiring token that you can use for future authenticated requests.
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