Exception: Got Http response code 500 when accessing https://api.sandBox.paypal.com/v1/payments/payment.
{"name":"INTERNAL_SERVICE_ERROR","message":"An internal service error has occurred","information_link":"https://developer.paypal.com/webapps/developer/docs/api/#INTERNAL_SERVICE_ERROR","debug_id":"e3c779ea99f73"}

这是我正在使用的代码(如果这里有太多信息,我很抱歉,我不知道哪些信息与我的问题有关)

<?PHP
include("bootstrap.PHP"); //Sample bootstrap file configured with my clientId and Secret,creates $apiContext
use PayPal\Api\CreditCard;
use PayPal\Api\Payer;
use PayPal\Api\FundingInstrument;
use PayPal\Api\Details;
use PayPal\Api\Amount;
use PayPal\Api\Transaction;
use PayPal\Api\Payment;
use PayPal\Api\Address;
use PayPal\Api\CreditCardToken;

$useVault = true;

$addr = new Address();
$addr->setLine1('52 N Main ST');
$addr->setCity('Johnstown');
$addr->setCountry_code('US');
$addr->setPostal_code('43210');
$addr->setState('OH');


$card = new CreditCard();
//Also used PayPal SandBox account number here
$card->setNumber('4111111111111111');
$card->setExpire_month('03');
$card->setExpire_year('2019');
$card->setCvv2('123');
$card->setFirst_name('Joe');
$card->setLast_name('Shopper');
$card->setType('visa');
$card->setBilling_address($addr);
$fi = new FundingInstrument();

//Setting $useVault to false here
// will attempt to make the payment without storing the CC in the vault
// Which works. having it use the vault will return a 500 error
if($useVault){
    //use Store the CC in the vault
    $response = $card->create($apiContext);
    $ccToken = new CreditCartToken();
    $ccToken->setCredit_card_id($response->id);
    $fi->setCredit_card_token($creditCardToken);
}else{
    $fi->setCredit_card($card);
}


$payer = new Payer();
$payer->setPayment_method('credit_card');
$payer->setFunding_instruments(array($fi));
$amountDetails = new Details();
$amountDetails->setSubtotal('7.41');
$amountDetails->setTax('0.03');
$amountDetails->setShipping('0.03');


$amount = new Amount();
$amount->setCurrency('USD');
$amount->setTotal('7.47');
$amount->setDetails($amountDetails);
$transaction = new Transaction();
$transaction->setAmount($amount);
$transaction->setDescription('This is the payment transaction description.');

$payment = new Payment();
$payment->setIntent('sale');
$payment->setPayer($payer);
$payment->setTransactions(array($transaction));
try {
    var_dump($payment->create($apiContext));
} catch (PayPal\Exception\PPConnectionException $ex) {
    echo "Exception: " . $ex->getMessage() . PHP_EOL;
    var_dump($ex->getData());
    exit(1);
}

如果我将$useVault更改为false,那么将进行付款并且交易将显示在开发人员沙箱中.
我使用了this guide at dev-tools.paypal.com,它似乎和我有同样的问题(我到了第4步,它打印出内部服务错误已经发生