"payer": {
        "payment_method": "paypal"
Let me get back to you after reviewing the payment. I think I have all that I need here. I will let you know as soon as possible.
          
$payer = new Payer();
$payer->setPaymentMethod("paypal");
$payer->setPayerInfo($payerInfo);
This is what i set to the payer to make it a paypal payment.
          
Any news concerning this problem?

Is it possible, that my paypal acc or the api settings are missing something?
EDIT:

I dont know if it helps but:

In the Dashboard under transaction I can see that all the payments done with the api samples are set to completed. where the payments done within my website are marked as pending.
          
Referencing to related Stack Overflow Issues:
http://stackoverflow.com/questions/15685963/paypal-certificate-invalid-or-not-found
http://stackoverflow.com/questions/24437381/paypal-rest-error-payment-state-invalid
Btw, from the debug messages that I was able to retrieve, I saw that the PayerID that you are passing doesnt seem to match the one used for execute.
Can you please confirm if they are the same. Btw, PayerId is now returned as a part of return URL when paypal redirects the browser to your /execute page.
For E.g. Sample code returns something like this:
http://localhost/paypal/PayPal-PHP-SDK/sample/payments/ExecutePayment.php?success=true&paymentId=PAY-60C519777S7370508KTZX4EY&token=EC-5K097793LN8781320&PayerID=REABK2UGK7PLW
As you can see, you could use the PayerID=REABK2UGK7PLW value using $_GET['PayerID'] command as shown in the sample code here.
Can you please let me know if that is infact what you are doing. I could further debug into the issue.
Btw, I was a bit occupied with the recent issue that we faced in PayPal-PHP-SDK, and couldn't get back to you sooner.
          
Also, @jziaja pointed me out to confirm if you have not enabled Payment Review in your developer dashboard.
Please have a look at reference issue: https://github.com/paypal/PayPal-NET-SDK/issues/79#issuecomment-74086718
thank you so much for your time.

Yes I receive the payerID with the $_Get and it seems to be the same. After that I use it to execute the payment. The same way like in the samples.

When I echo the payment state within my execution code it say:

Before execution: created

After execution: approved.

But the payment state for the payments over my website are still pending (sandbox -> transactions)

while the ones made with the samples are set to completed.
Payment Review is not enabled.
          
Interesting. Let me get the Payment Team involved more into debugging this issue. Can you, in the mean time, create a new clientId and try to replicate it.
My apologies for you running through this issue, but I assure you, we will fix it :)
          
Hey @borki23 ! Is it possible for you to send your clientId. Or create a new one, and send it to us.
The issue you are facing seems to be specific to your account. Btw, Can you please try out these steps:
Go to sample/bootstrap.php Line 29
And replace the clientId and secret with yours.
Run the sample, and see if you are still getting Pending error.
This should help us understand if there might be something in your server code that might be causing the issue.
          
Hello,

I've created a new App with new Buyer and Seller account.

I have chosen payment card to paypal and visa card to none.

When i go into the transaction tap all incoming payments from my website with currency EUR are now set so completed. The ones from the sample code with currency US are set to pending.

Before that it was the other way around.

But I still get a 400 exception while excecuting. Strangely, this happens a few seconds after the execution of the payment, so other parts of my code are getting called anyway.
I will send you my clientId to you email if you're okay with that.
Thank you.
EDIT: I changed the currency in the samples to EUR and now their status is completed aswell. So this seemed to be my mistake. Sorry. But I still get the exception after the execution.
          
Yes. Please send me your clientId at [email protected].
Also, I will be online 10-5 CST approximately, and if possible, we could setup a quick chat/hangout session to discuss this quicker than over the issue tracker.
Thanks.
EDIT:
Just had a skype chat with jaypatel512.

The problem was that I accidentally executed the payment twice.

So, the first time everything went fine. But the second execution threw the 400 exception

For all you guys having trouble: try to check the state of the payment before executing it.
//get payment
if ($payment->getState() == 'created') {
    //execute payment if it was created successfully
Thank you.
          
You can get more information exact detail about that 400. You can add a catch exception as shown here: https://github.com/paypal/PayPal-PHP-SDK/wiki/exception-%27PayPal%5CException%5CPayPalConnectionException%27-with-message-%27Got-Http-response-code-400-when-accessing
Can you let us know what the error data is in that exception, and we can help you further.
I have made the curl request for access token of sandbox account using below code:
$ch = curl_init();

$curlConfig = array(

CURLOPT_URL            => "https://api.sandbox.paypal.com/v1/oauth2/token",

CURLOPT_POST           => true,

CURLOPT_RETURNTRANSFER => true,

CURLOPT_POSTFIELDS     => array(

'Accept' => 'application/json',

'Accept-Language' => 'en_US',

'Client Key' => 'Secret Key',

'grant_type' => 'client_credentials'

curl_setopt_array($ch, $curlConfig);

$result = curl_exec($ch);

curl_close($ch);
And get following error:
{"name":"AUTHENTICATION_FAILURE","message":"Authentication failed due to invalid authentication credentials or a missing Authorization header.","links":[{"href":"https://developer.paypal.com/docs/api/overview/#error","rel":"information_link"}]}
Please help me to resolve this issue.

Thanks in advance.