PHP (Laravel) - Authorization Error result when using Payouts

[moxiefitness]

I'm trying to use the PayPal Payouts with a sandbox app.

Using postman-

1. I get the access_token from https://api.sandbox.paypal.com/v1/oauth2/token using client_id & client secrete

2. Attempt to make a payout posting https://api.sandbox.paypal.com/v1/payments/payouts

  Datatype is json

 {
    "sender_batch_header": {
        "sender_batch_id": "5a7a72af05adc",
        "email_subject": "Payout test"
    },
    "items": [
        {
            "recipient_type": "EMAIL",
            "note": "Thank you!",
            "receiver": "--some email not allowed--",
            "sender_item_id": "20180206001",
            "amount": {
                "value": "3.40",
                "currency": "USD"
            }
        }
    ]
}

Response :

{
    "name": "AUTHORIZATION_ERROR",
    "debug_id": "8fece29112011",
    "message": "Authorization error occurred.",
    "information_link": "https://developer.paypal.com/docs/api/payments.payouts-batch/#errors"
}

Same thing happens when I do it in Laravel :

        $payout = new Payout();
        $sender_batch_header = new PayoutSenderBatchHeader();
        $sender_item = new PayoutItem();

        // Payout amount
        $amount = new Currency();
        $amount->setValue('3.4');
        $amount->setCurrency('USD');

        // Set batch header
        $sender_batch_header->setSenderBatchId(uniqid())
            ->setEmailSubject('Payout test');


        // Set the item
        $sender_item->setRecipientType('EMAIL')
            ->setNote('Thank you ')
            ->setReceiver($request['email'])
            ->setSenderItemId('20180206001')
            ->setAmount($amount);

        // Set up the payout
        $payout->setSenderBatchHeader($sender_batch_header)
            ->addItem($sender_item);


        $request = clone $payout;

        try {
            $output = $payout->create( null, $this->apiContext);
            return $output;
        } catch (PayPalConnectionException $ex) {
            return $ex->getData();
        }

And the exception data is: 

 {"name":"AUTHORIZATION_ERROR","debug_id":"7bb53dcdde651","message":"Authorization error occurred.","information_link":"https://developer.paypal.com/docs/api/payments.payouts-batch/#errors"}

I have made sure that Payouts is enabled in the sandbox application, and the email accounts I'm using exist in the sandbox accounts as well.

[Colin563]

I had same problem can you please help me out, in fixing this, how can enable my app to use PayOut API?