init_oauth2.0(endpoint, app, scope = NULL, user_params = NULL,
type = NULL, use_oob = getOption("httr_oob_default"),
is_interactive = interactive(), use_basic_auth = FALSE)oauth_endpointoauth_app"httr_oob_default" default,
or TRUE if httpuv is not installed.TRUE use http basic authentication to
retrieve the token. Some authorization servers require this.
If FALSE, the default, retrieve the token by including the
app key and secret in the request body.