I find solution in oscommerce forum, as would fit in zen cart?
Open catalog/includes/modules/payment/paypal_standard.php
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Find:
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global $cartID, $cart_PayPal_Standard_ID, $customer_id, $languages_id, $order, $order_total_modules;

Replace with this:
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#### Points/Rewards Module V2.00 balance customer points BOF ####
// global $cartID, $cart_PayPal_Standard_ID, $customer_id, $languages_id, $order, $order_total_modules;
global $cartID, $cart_PayPal_Standard_ID, $customer_id, $languages_id, $order, $customer_shopping_points, $customer_shopping_points_spending, $order_total_modules;
#### Points/Rewards Module V2.00 balance customer points EOF ####*/

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Find:
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tep_db_perform(TABLE_ORDERS_TOTAL, $sql_data_array);
}

Add after:
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#### Points/Rewards Module V2.1rc2a balance customer points BOF ####
if ((USE_POINTS_SYSTEM == 'true') && (USE_REDEEM_SYSTEM == 'true')) {
// customer pending points added
if ($order->info['total'] > 0) {
$points_toadd = get_points_toadd($order);
$points_comment = 'TEXT_DEFAULT_COMMENT';
$points_type = 'SP';
if ((get_redemption_awards($customer_shopping_points_spending) == true) && ($points_toadd >0)) {
tep_add_pending_points($customer_id, $insert_id, $points_toadd, $points_comment, $points_type);
}
}
// customer referral points added
if ((tep_session_is_registered('customer_referral')) && (tep_not_null(USE_REFERRAL_SYSTEM))) {
$referral_twice_query = tep_db_query("select unique_id from " . TABLE_CUSTOMERS_POINTS_PENDING . " where orders_id = '". (int)$insert_id ."' and points_type = 'RF' limit 1");
if (!tep_db_num_rows($referral_twice_query)) {
$points_toadd = USE_REFERRAL_SYSTEM;
$points_comment = 'TEXT_DEFAULT_REFERRAL';
$points_type = 'RF';
tep_add_pending_points($customer_referral, $insert_id, $points_toadd, $points_comment, $points_type);
}
}
// customer shoppping points account balanced
if ($customer_shopping_points_spending) {
tep_redeemed_points($customer_id, $insert_id, $customer_shopping_points_spending);
}
}
#### Points/Rewards Module V2.1rc2a balance customer points EOF ####*/

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Find:
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tep_session_unregister('shipping');
tep_session_unregister('payment');
tep_session_unregister('comments');

Add after:
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tep_session_unregister('customer_shopping_points');// Points/Rewards Module v1.10
tep_session_unregister('customer_shopping_points_spending');// Points/Rewards Module v1.10
tep_session_unregister('customer_referral');// Points/Rewards Module V2.00

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That's all
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