payment_gateway.authorizenet:
    apiLoginId: xxxxxxxx
    transactionKey: xxxxxxxx
    postUrl: https://test.authorize.net/gateway/transact.dll

$gateway = $this->container->get('payment_gateway.authorizenet.config');

$gateway->setAddress($address);
$gateway->setAmount($amount);
$gateway->setPaymentMethod($creditCard);
$gateway->setOrder($order);

$gateway->authorize();

or

$gateway->capture();

if ($gateway->hasErrors())
{
throw new \Exception($gateway->getErrorMessage());
}

$response = $gateway->getResponse();
$transactionId = $response->getTransactionId();
$code = $response->getResponseCodeText();
$type = $response->getTransactionType());