RE: Paypal?

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http://forums.oscommerce.com/viewtopic.php?p=228681#228681
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You can use the default paypal. 
Just in case someone doesn't click continue to get back to your site
here is a mod to include into your PayPal module to you can see what the customer ordered on your PayPal payment notification (just in case they don't return to your site to complete the process and generate an invoice) -

BACK UP BACK UP BACK UP

change the following code:

function process_button() {
global $order, $currencies, $currency;

if (MODULE_PAYMENT_PAYPAL_CURRENCY == 'Selected Currency') {
$my_currency = $currency;
} else {
$my_currency = substr(MODULE_PAYMENT_PAYPAL_CURRENCY, 5);
}
if (!in_array($my_currency, array('CAD', 'EUR', 'GBP', 'JPY', 'USD'))) {
$my_currency = 'USD';
}
$xx = '';
for ($i=0; $i<sizeof($order->products); $i++) {
$xx .= $order->products[$i]['qty'] . '-' . ($order->products[$i]['name']) . '**';
}
$process_button_string = tep_draw_hidden_field('cmd', '_xclick') .
tep_draw_hidden_field('business', MODULE_PAYMENT_PAYPAL_ID) .
tep_draw_hidden_field('item_name', STORE_NAME . ' ' . $xx) .
tep_draw_hidden_field('amount', number_format(($order->info['total'] - $order->info['shipping_cost']) * $currencies->get_value($my_currency), $currencies->get_decimal_places($my_currency))) .
tep_draw_hidden_field('shipping', number_format($order->info['shipping_cost'] * $currencies->get_value($my_currency), $currencies->get_decimal_places($my_currency))) .
tep_draw_hidden_field('currency_code', $my_currency) .
tep_draw_hidden_field('return', tep_href_link(FILENAME_CHECKOUT_PROCESS, '', 'SSL')) .
tep_draw_hidden_field('cancel_return', tep_href_link(FILENAME_CHECKOUT_PAYMENT, '', 'SSL'));

return $process_button_string;
}


the above code snippet replaces the code snippet in the catalog/includes/modules/payment/paypal.php file

look for

function process_button() {

and then copy and paste and replace that section of code with the code above