'Return the payload for this token.'

def payload(self):

    if (('outgoing' in self.capabilities) and (self.client_name is not None)):
        scope = self.capabilities['outgoing']
        scope.params['clientName'] = self.client_name
    capabilities = self.capabilities.values()
    scope_uris = [str(scope_uri) for scope_uri in capabilities]
    return {'scope': '    '.join(scope_uris)}
