Как осуществить оплату с помощью кредитной карты PayPal Payflow без использования PNREF (шлюз-токен)?

Я добавил кредитную карту в хранилище, используя приведенный ниже скрипт.

Как произвести оплату на странице оформления заказа с помощью этой кредитной карты?

$clientId="XXXXXXXXXXXXXXXXXXXXX";
$secret='XXXXXXXXXXXXXXXXXXXXXXX';

$ipnexec = curl_init();

curl_setopt($ipnexec, CURLOPT_URL, "https://api.sandbox.paypal.com/v1/oauth2/token"); // test url

curl_setopt($ipnexec, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ipnexec, CURLOPT_POST, true);
curl_setopt($ipnexec, CURLOPT_USERPWD, $clientId.":".$secret);
curl_setopt($ipnexec, CURLOPT_POSTFIELDS, "grant_type=client_credentials");
//curl_setopt($ipnexec, CURLOPT_POSTFIELDS, $req);
//curl_setopt($ipnexec, CURLOPT_FOLLOWLOCATION, 0);
curl_setopt($ipnexec, CURLOPT_RETURNTRANSFER, true);
//curl_setopt($ipnexec, CURLOPT_TIMEOUT, 30);
$ipnresult = curl_exec($ipnexec);
$result = json_decode($ipnresult);

if(!isset($result->access_token))
{
$this->messageManager->addErrorMessage(
__('Invalid Card data, please try again!')
);

return $this->_redirect('vault/cards/listaction');
}

//print_r($result);
//die;
//echo "<pre>";
$access_token = $result->access_token;
//die($access_token);
//print_r($result->access_token);
//$token_type = $result->token_type;
curl_close($ipnexec);$scope = "https://api.sandbox.paypal.com/v1/vault/credit-cards";$ch = curl_init();
//curl_setopt($ch, CURLOPT_HTTPHEADER, 1);
$data = '
{
"external_customer_id":"'.$customer_id.'",
"external_card_id":"'.$external_card_id.'",
"payer_id":"'.$payer_id.'",
"type":"visa",
"cvv2" : "'.$cvv2.'",
"number":"'.str_replace(" ","",$number).'",
"expire_month":"'.$expire_month.'",
"expire_year":"'.$expire_year.'",
"first_name":"'.$first_name.'",
"last_name":"'.$last_name.'"
}
';

curl_setopt($ch, CURLOPT_URL,$scope);
curl_setopt($ch, CURLOPT_HTTPHEADER, array("Content-Type:
application/json","Authorization: Bearer ".$access_token));
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $data);

curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);$result = curl_exec($ch);

if(empty($result))die("Error: No response.");
else
{
$json = json_decode($result);
//echo "<pre>";
//print_r($json);
//die;

if(!isset($json->payer_id))
{
$this->messageManager->addErrorMessage(
__('Invalid Card data, please try again!')
);

return $this->_redirect('vault/cards/listaction');
}

}
curl_close($ch);