Payment Plugin for National Bank of Greece

Hello,
I'm developing a new payment plugin for solidres, using the 3D security API of National Bank of Greece
I use as reference your paypal and cielo plugin.
I've managed to complete it, but I have 1-2 questions about the complete process.
I've seen at Paypal and Cielo plugin that in OnSolidresPaymentCallback function you update the reservation using payment_method_txn_id and/or payment_status and/or total_paid. I decide to do the same.
But when I try my plugin, after a success payment through the bank API, the reservation is updated only to payment_status ( with a good 1 - Completed).
The #__sr_reservations -> state is steel 0 and that means that someone else could make the same request and paid for the same room the same days.
Should be right to update the state to confirmed after a success payment?

Thank you!