/**
* Initialises a payment for the supplied payment transaction using SagePay.
* Returns a URL to redirect the user to (normally a hosted payment form).
*
* @param PaymentTransaction $paymentTransaction The payment transaction we've created
* @return string The URL to forward the user to
*/
public static function initialisePayment($paymentTransaction)
{
if ($paymentTransaction->status == 'ptsSubmitted') {
return $paymentTransaction->initialResponse->NextURL;
}
// Generate a unique TX code
$cart = $paymentTransaction->cart;
$user = User::find_by_id($cart->user_id);
$gateway = $paymentTransaction->paymentgateway;
$paymentTransaction->sender = $user->email;
// We need to build the basket data
$basket = '';
$count = 0;
// Item Discounts
foreach ($cart->items() as $item) {
$count++;
$amount = self::formatMoney($item->initial_cost());
$desc = str_replace(':', '', $item->description);
$basket .= ":{$desc}:1:::{$amount}:{$amount}";
if ($item->discount->id) {
$item->discount->reload();
$count++;
if ($item->discount->discount->type == "percentage") {
$amount = self::formatMoney($item->discount->discount->calculate_saving($item->initial_cost()));
} else {
$amount = self::formatMoney($item->discount->discount->value);
}
$desc = str_replace(':', '', "{$item->discount->discount->code}) {$item->discount->discount->description}");
$basket .= ":{$desc}:1:::-{$amount}:-{$amount}";
}
}
// Full Cart Discounts
if ($cart->full_cart_discount()) {
foreach ($cart->discounts(true) as $discount) {
if ($discount->cart_item_id) {
continue;
}
$count++;
if ($discount->discount->type == "percentage") {
$amount = self::formatMoney($discount->discount->calculate_saving($cart->cost(0, 1)));
} else {
$amount = self::formatMoney($discount->discount->value);
}
$desc = str_replace(':', '', "Discount ({$discount->discount->code}) {$discount->discount->description}");
$basket .= ":{$desc}:1:::-{$amount}:-{$amount}";
}
}
$basket = "{$count}{$basket}";
// Prepare our parameters
$params = array('VPSProtocol' => '3.00', 'TxType' => 'PAYMENT', 'Vendor' => $gateway->getSetting('vendor'), 'VendorTxCode' => $paymentTransaction->id, 'Amount' => $paymentTransaction->getFormattedAmount(), 'Currency' => 'GBP', 'Description' => "epic.LAN Cart {$cart->id}", 'NotificationURL' => $gateway->getSetting('notificationurl'), 'BillingSurname' => $user->surname, 'BillingFirstnames' => $user->firstname, 'BillingAddress1' => $user->address1, 'BillingAddress2' => $user->address2, 'BillingCity' => $user->towncity, 'BillingPostCode' => $user->postcode, 'BillingCountry' => strtoupper($user->country->code), 'DeliverySurname' => $user->surname, 'DeliveryFirstnames' => $user->firstname, 'DeliveryAddress1' => $user->address1, 'DeliveryAddress2' => $user->address2, 'DeliveryCity' => $user->towncity, 'DeliveryPostCode' => $user->postcode, 'DeliveryCountry' => strtoupper($user->country->code), 'Basket' => $basket);
if (strtoupper($user->country->code) == 'US') {
$params['BillingState'] = $user->county;
$params['DeliveryState'] = $user->county;
}
// Make our request
$url = $gateway->getSetting('endpoint');
$output = self::httpPost($url, $params);
// Parse the response
$lines = explode("\r\n", $output);
$response = new stdClass();
foreach ($lines as $line) {
$line = explode('=', $line);
$key = array_shift($line);
$response->{$key} = implode('=', $line);
}
if (property_exists($response, 'VPSTxId')) {
$paymentTransaction->externalid = $response->VPSTxId;
}
$paymentTransaction->initialResponse = $response;
if ($response->Status == 'OK') {
$paymentTransaction->status = 'ptsSubmitted';
$paymentTransaction->save();
return $response->NextURL;
}
$paymentTransaction->failurereason = $response->StatusDetail;
$paymentTransaction->status = 'ptsFailed';
$paymentTransaction->save();
throw new PGI_Exception('Unable to establish payment session');
}
