when using stored card in Paypal Vault it return INTERNAL SERVICE ERROR

Question

What is issue in my code:Using Vault api in paypal credit card information saved but when i using saved card then get error

function paypalPaymentViaStoredCreditCard_post()
{
    $access_token = "XXXXXXXX";
    $ch = curl_init();
    $data = '{
        "intent": "sale",
        "payer": {
          "payment_method": "credit_card",
          "funding_instruments":[
            {
              "credit_card_token": {
                "credit_card_id": "CARD-6F0009583J819301DK5DO5JA",
                "payer_id": "BAAAA"
              }
            }
          ]
        },
        "transactions":[
          {
            "amount":{
            "total":"100.00",
            "currency":"USD"
            },
            "description": "This is the payment transaction description."
          }
        ]
      }';


     curl_setopt($ch, CURLOPT_URL, "https://api.sandbox.paypal.com/v1/payments/payment");
     curl_setopt($ch, CURLOPT_POST, true);
     curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
     curl_setopt($ch, CURLOPT_HTTPHEADER, array(
     "Content-Type:application/json",
     "Authorization: Bearer " . $access_token,
     "Content-length: " . strlen($data))
     );


    curl_setopt($ch, CURLOPT_USERAGENT, "User-Agent: Some-Agent/1.0");
    $result = curl_exec($ch);
    print_r($result);die;
    if (empty($result)) die("Error: No response.");
    else {
          $json = json_decode($result);
          print_r($json);
          die;
          return $json;
    }
    curl_close($ch);
} 

OUTPUT Here

{"name":"INTERNAL_SERVICE_ERROR","information_link":"https://api.sandbox.paypal.com/docs/api/#INTERNAL_SERVICE_ERROR","debug_id":"b33db4a496dfc"}

Answer 1

As I didn't get any solution from anybody so I dug into my code step by step and found solution.there is no bug in my code only credit card no and negative testing issue.i follow following post on stackoverflow and get get success

PayPal Sandbox API endpoint returning 503 "Internal Service Error" error

PayPal Sandbox returning Internal Service Error