Whether the access token is still valid or not. . unixtime. is_valid. I have implemented a login with facebook method in my website. Timestamp when this access token expires. expires_at. Does anyone can help me, please ??The error subcode for the error. bool. int. Originally it works fine, but suddenly this past few days it won't work anymore, The error subcode for the error. Error Code 1 Error Sub Code 1357045 Message Unknown Error (empty response) Type Http Status 0