public function payout(User $user, $amount, $currency, $paypalEmail, $withdrawalId)
{
$payouts = new Payout();
$senderBatchHeader = new \PayPal\Api\PayoutSenderBatchHeader();
$senderBatchHeader->setSenderBatchId($withdrawalId)->setEmailSubject("ADTW.ch withdraw");
$senderItem = new \PayPal\Api\PayoutItem();
$senderItem->setRecipientType('Email')->setNote('Thanks for your using ADTW.ch')->setReceiver($paypalEmail)->setSenderItemId($user->id . '_' . $withdrawalId . '_' . date('YmdHis'))->setAmount(new \PayPal\Api\Currency('{
"value":"' . floatval($amount) . '",
"currency":"' . strtoupper($currency) . '"
}'));
$payouts->setSenderBatchHeader($senderBatchHeader)->addItem($senderItem);
$output = $payouts->createSynchronous($this->apiContext);
return $output;
}