private static function _setInvoiceNumber(PayPal\Api\Transaction &$transaction)
{
$transaction->setInvoiceNumber(uniqid());
}
$payer = new \PayPal\Api\Payer();
$payer->setPaymentMethod('credit_card');
$payer->setFundingInstruments(array($fi));
$amountDetails = new \PayPal\Api\Details();
$amountDetails->setSubtotal(str_replace(",", "", number_format($_SESSION['subtotal'], 2)));
$amountDetails->setTax(str_replace(",", "", number_format($_SESSION['tax_amount'], 2)));
$amountDetails->setShipping(str_replace(",", "", number_format($_SESSION['shipping_amount'], 2)));
$amountDetails->setHandlingFee(str_replace(",", "", number_format($_SESSION['handling_amount'], 2)));
$amount = new \PayPal\Api\Amount();
$amount->setCurrency(isset($config['CurrencyCode']) ? $config['CurrencyCode'] : 'USD');
$amount->setTotal(str_replace(",", "", number_format($_SESSION['amount'], 2)));
$amount->setDetails($amountDetails);
$transaction = new \PayPal\Api\Transaction();
$transaction->setAmount($amount);
$transaction->setDescription(isset($_SESSION['item_name']) && $_SESSION['item_name'] != '' ? $_SESSION['item_name'] : 'PayPal Payments Pro Virtual Terminal Sale');
$transaction->setInvoiceNumber($_SESSION['invoice']);
$transaction->setCustom($_SESSION['notes']);
$payment = new \PayPal\Api\Payment();
$payment->setIntent(strtolower($_SESSION['transaction_type']));
$payment->setPayer($payer);
$payment->setTransactions(array($transaction));
try {
$payment->create($paypal_rest);
if ($payment->getState() == 'approved') {
$transactions = $payment->getTransactions();
foreach ($transactions as $txn) {
$related_resources = $txn->getRelatedResources();
foreach ($related_resources as $related) {
$related_sale = $related->getSale();
if ($related_sale) {
$_SESSION['transaction_id'] = $related_sale->id;
