There is nothing much to do on a new opay traditional POS. What you can do is to insert a Sim card that has active data subscription inside the POS. Then power the POS on and use the your ATM to perform a Withdrawal/cashout on it. if the transaction is successful, login to your opay app and check if you are credited for the transaction. If yes, that means you can start using the POS
Mention delon.ng when calling seller to get a good deal