+ASTAKOS_BILLING_FIELDS ['id', 'is_active', 'provider', 'third_party_identifier'] AstakosUser fields to propagate in the billing system
+ASTAKOS_QUEUE_CONNECTION The queue connection ex. 'rabbitmq://guest:guest@localhost:5672/astakos'
+ (if it is not set, it does not send messages)
+ASTAKOS_RE_USER_EMAIL_PATTERNS [] Email patterns that are automatically activated ex. ['^[a-zA-Z0-9\._-]+@grnet\.gr$']
+
+ASTAKOS_LOGIN_MESSAGES {} Notification messages to display on login page header
+ e.g. {'warning': 'Warning message (can contain html)'}
+ASTAKOS_PROFILE_EXTRA_LINKS {} messages to display as extra actions in account forms
+ e.g. {'https://cms.okeanos.grnet.gr/': 'Back to ~okeanos'}