refreshToken method
Implementation
Future refreshToken({
required String rtoken,
}) async {
var url = '/refresh-token';
var params = {
'refreshToken': rtoken,
};
var resp = await _invoke(url, params);
if (resp['result'] != 'OK') throw resp['result'];
_userName = resp['userName'];
_token = resp['token'];
_tokenExpire = resp['tokenExpire'];
}