public function process_payment_start(EE_Line_Item $total_line_item, $transaction = null, $total_to_pay = NULL)
{
$paypal_settings = $this->_payment_settings;
$paypal_id = $paypal_settings['paypal_id'];
$paypal_cur = $paypal_settings['currency_format'];
$no_shipping = $paypal_settings['no_shipping'];
$item_num = 1;
/* @var $transaction EE_Transaction */
if (!$transaction) {
$transaction = $total_line_item->transaction();
}
$primary_registrant = $transaction->primary_registration();
if ($total_to_pay === NULL && $total_to_pay != $transaction->total() && !$transaction->paid()) {
//and there have been no payments on the transaction yet anyways
//so let's create a nice looking invoice including everything
foreach ($total_line_item->get_items() as $line_item) {
$this->addField('item_name_' . $item_num, substr(sprintf(__('%s for %s', 'event_espresso'), $line_item->name(), $line_item->ticket_event_name()), 0, 127));
$this->addField('amount_' . $item_num, $line_item->unit_price());
$this->addField('quantity_' . $item_num, $line_item->quantity());
$item_num++;
}
foreach ($total_line_item->tax_descendants() as $tax_line_item) {
$this->addField('item_name_' . $item_num, substr($tax_line_item->name(), 0, 127));
$this->addField('amount_' . $item_num, $tax_line_item->total());
$this->addField('quantity_' . $item_num, '1');
$item_num++;
}
} else {
//we're only charging for part of the transaction's total
if ($total_to_pay) {
//client code specified how much to charge
$description = sprintf(__("Partial payment of %s", "event_espresso"), $total_to_pay);
} elseif ($transaction->paid()) {
//they didn't specify how much, but there has already been a payment, so let's just charge on what's left
$total_to_pay = $transaction->remaining();
$description = sprintf(__("Total paid to date: %s, and this charge is for the balance.", "event_espresso"), $transaction->get_pretty('TXN_paid'));
} else {
throw new EE_Error(sprintf(__("Thats impossible!!", "event_espresso")));
}
$this->addField('item_name_' . $item_num, sprintf(__("Amount owing for registration %s", 'event_espresso'), $primary_registrant->reg_code()));
$this->addField('amount_' . $item_num, $total_to_pay);
$this->addField('on0_' . $item_num, __("Amount Owing:", 'event_espresso'));
$this->addField('os0_' . $item_num, $description);
$item_num++;
}
if ($paypal_settings['use_sandbox']) {
$this->addField('item_name_' . $item_num, 'DEBUG INFO (this item only added in sandbox mode)');
$this->addField('amount_' . $item_num, 0);
$this->addField('on0_' . $item_num, 'NOTIFY URL');
$this->addField('os0_' . $item_num, $this->_get_notify_url($primary_registrant));
}
$this->addField('business', $paypal_id);
$this->addField('return', $this->_get_return_url($primary_registrant));
$this->addField('cancel_return', $this->_get_cancel_url());
$this->addField('notify_url', $this->_get_notify_url($primary_registrant));
$this->addField('cmd', '_cart');
$this->addField('upload', '1');
$this->addField('currency_code', $paypal_cur);
$this->addField('image_url', empty($paypal_settings['image_url']) ? '' : $paypal_settings['image_url']);
$this->addField('no_shipping ', $no_shipping);
do_action('AHEE_log', __FILE__, __FUNCTION__, serialize(get_object_vars($this)));
$this->_EEM_Gateways->set_off_site_form($this->submitPayment());
$this->redirect_after_reg_step_3($transaction, $paypal_settings['use_sandbox']);
}