This module is fantastic. There was only one small issue, the points can be redeemed for the shipping costs also. We use paypal as our payment module and if there is nothing to pay except something towards the shipping then paypal wont work.
I got round this by changing line 369 on checkout_payment.php
from
$max_points = ($order->info['total']/REDEEM_POINT_VALUE > POINTS_MAX_VALUE ? POINTS_MAX_VALUE : $order->info['total']/REDEEM_POINT_VALUE-1);
to
$max_points = ($order->info['total']/REDEEM_POINT_VALUE > POINTS_MAX_VALUE ? POINTS_MAX_VALUE : $order->info['subtotal']/REDEEM_POINT_VALUE-1);
just one small change, $order->info['total'] to $order->info['subtotal']
i hope this is helpful to someone
thankyou for this module