Пакетная выплата в песочнице PayPal — SENDER_RESTRICTED

Я пытаюсь выполнить пакетную выплату PayPal в песочнице и получаю следующую ошибку:

{
"debug_id": "c0c02d9a5a9f2",
"information_link": "https://developer.paypal.com/webapps/developer/docs/api/#SENDER_RESTRICTED",
"message": "Authorization error occurred",
"name": "SENDER_RESTRICTED"}

Я использую PayPal PHP API, который я немного реорганизовал. Это моя функция авторизации:

private function pp_getApiContext($clientId, $clientSecret)
{
// ### API CONTEXT
// USE AN APICONTEXT OBJECT TO AUTHENTICATE API CALLS. THE CLIENTID AND CLIENTSECRET FOR THE
// OAUTHTOKENCREDENTIAL CLASS CAN BE RETRIEVED FROM DEVELOPER.PAYPAL.COM
$apiContext = new ApiContext(new OAuthTokenCredential($clientId, $clientSecret));

// COMMENT THIS LINE OUT AND UNCOMMENT THE PP_CONFIG_PATH
// 'DEFINE' BLOCK IF YOU WANT TO USE STATIC FILE BASED CONFIGURATION
$apiContext->setConfig(array('mode' => 'sandbox',
'log.LogEnabled' => true,
'log.FileName' => './logs/PayPal/PayPal.log',
'log.LogLevel' => 'DEBUG', // PLEASE USE `FINE` LEVEL FOR LOGGING IN LIVE ENVIRONMENTS
'cache.enabled' => true));

return $apiContext;
}

И это моя функция выплат:

private function pp_CreateBatchPayout($apiContext, $payoutId, $orders)
{
// CREATE A NEW INSTANCE OF PAYOUT OBJECT
$payouts = new \PayPal\Api\Payout();

$senderBatchHeader = new \PayPal\Api\PayoutSenderBatchHeader();
$senderBatchHeader->setSenderBatchId($payoutId);
$senderBatchHeader->setEmailSubject("You have a payment");
$payouts->setSenderBatchHeader($senderBatchHeader);

foreach($orders as $item_order)
{
// #### SENDER ITEM
// PLEASE NOTE THAT IF YOU ARE USING SINGLE PAYOUT WITH SYNC MODE, YOU CAN ONLY PASS ONE ITEM IN THE REQUEST
$senderItem = new \PayPal\Api\PayoutItem();
$senderItem->setRecipientType('Email')
->setReceiver($item_order['email'])
->setAmount(new \PayPal\Api\Currency("{ \"value\":\"{$item_order['commissionAmount']}\", \"currency\":\"AUD\" }"))
->setSenderItemId($item_order['commissionId'])
->setNote("Store Name [{$item_order['storeName']}]");

$payouts->addItem($senderItem);
}

// ### CREATE PAYOUT
$output = $payouts->create(null, $apiContext);
$this->logger->info("CREATED BATCH PAYOUT ID [{$output->getBatchHeader()->getPayoutBatchId()}] REQUEST [{$payouts}] OUTPUT [{$output}]");

return $output;
}

Любая помощь приветствуется. Спасибо