Braintree交易问题

I am using braintree sandbox payment in my laravel project.

The problem is when i create transaction it ends up the vault section rather then transaction section.

    $result = \Braintree_Transaction::sale([
             'customerId' => $brainTreeUser->customer->id,
             'amount' => 100,
             'paymentMethodNonce' => $client_nonce->paymentMethodNonce->nonce,
             'options'=>[
                'submitForSettlement'=>true
             ]
        ]);

Can someone please help me out.