toJson method
convert this instance to one Map
Implementation
Map<String, dynamic> toJson() => {
'userId': userId,
'token': token,
'expirationDate': expirationDate,
'refreshDate': refreshDate,
'appID': appID,
'graphDomain': graphDomain,
'isExpired': isExpired,
'permissions': permissions,
'declinedPermissions': declinedPermissions,
'dataAccessExpirationDate': dataAccessExpirationDate,
};