You can receive API token for SAASU in 2 ways:

1. By providing SAASU_LOGIN and SAASU_PASSWORD, and looking into application logs
2. Also you can query for required refresh token the API directly, for this you should execute following command in terminal:

curl -XPOST -H "Content-Type: application/json" -d '{"username": "<USER>", "password": "<PASSWORD>", "grant_type": "password", "scope": "full"}' https://api.saasu.com/authorisation/token

(don't forget to replace <USER> and <PASSWORD> with actual values), in the response you'll receive something like

{"access_token":"eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9",
"token_type":"Bearer",
"expires_in":10800,
"refresh_token":"eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9",
"scope":"fileid:12356"}

Now, copy value for refresh_token (without quotes) into configuration variable named SAASU_REFRESH_TOKEN, and your're ready to go!