Disconnect
To disconnect from Xero call a ->disconnect() method.
The disconnect will send a POST request to Xero to revoke the connection, in addition, the stored token will be deleted.
Xero::disconnect();
Typically, you only want to run this is there is a connection, so it makes sense to wrap this in a ->isConnected() check:
if (Xero::isConnected()) {
Xero::disconnect();
}