The signals API is:
* AuthorizationDenied(String app_name) * CredentialsError(String app_name, String error_message, String detailed_error) * CredentialsFound(Dict of {String, String} credentials)
The signals API is:
* AuthorizationDe nied(String app_name) r(String app_name, String error_message, String d(Dict of {String, String} credentials)
* CredentialsErro
detailed_error)
* CredentialsFoun