Because then it's a 3-way conversation with nobody in the center. It's better to have the client do the transaction with the payment gateway, pass the token whi

Because then it's a 3-way conversation with nobody in the center. It's better to have the client do the transaction with the payment gateway, pass the token which they already have to your server on the orderPlace call which you then verify with the gateway. Otherwise the client could be asking for order confirmation before you know about the transaction.