Bug: Doesn't add tax to Paypal subscriptions

Just reporting a bug in the paypal processing plugin found when I upgraded from aMember 2.x.x to 3.0.8

The paypal payment plugin doesn't at tax to subscriptions products.

To fix this bug, in plugins/payment/paypal_r/paypal_r.inc.php line 193 I added the follow code (which was in my previous version of paypal_r.inc.php

PHP:

$a[3] = $total_price; // dirty hack to make coupons working!

The full version of the function build_subscription_params at line:137 now looks like.

PHP:

function build_subscription_params($products, $total_price){
        $a = $p = $t = array(1 => '', 2 => '', 3 => '');
        $was_recurring = 0;
        foreach ($products as $pr){
            $pa = $pp = $pt = array(1 => '', 2 => '', 3 => '');
            $pa[1] = $pr['trial1_price'];
            $pa[2] = $pr['trial2_price'];
            $pa[3] = $pr['price'];
            if ($pr['trial1_days'] != '')
                list($pp[1], $pt[1]) = $this->get_days($pr['trial1_days']);
            if ($pr['trial2_days'] != '')
                list($pp[2], $pt[2]) = $this->get_days($pr['trial2_days']);
            if ($pr['expire_days'] != '')
                list($pp[3], $pt[3]) = $this->get_days($pr['expire_days']);
            if (!$pr['is_recurring']){
                fatal_error(_PLUG_PAY_PAYPALR_FERROR7);
                //$a[1] += $pa[3];
                // there is at least one recurring product if we went here
            } else { // recurring
                if ($was_recurring){ // check if it was compatible
                    if (array_diff($p, $pp) || array_diff($t, $pt))
                        fatal_error(_PLUG_PAY_PAYPALR_FERROR8);
                }
                $a[1]+=$pa[1]; $a[2]+=$pa[2]; $a[3]+=$pa[3];
                $p[1] =$pp[1]; $p[2] =$pp[2]; $p[3] =$pp[3];
                $t[1] =$pt[1]; $t[2] =$pt[2]; $t[3] =$pt[3];
                $was_recurring++;
            }
        }
        if ($a[1] && !$p[1]){
            $p[1] = $p[3];
            $t[1] = $t[3];
        }
        ///
        if ($disc = $GLOBALS['COUPON_DISCOUNT']){
            if ($a[1]){ // first trial used, make second
                fatal_error(_PLUG_PAY_PAYPALR_ERROR12);
            } else {
                $a[1] = $a[3] - $disc;
                $p[1] = $p[3];
                $t[1] = $t[3];
            }
        }
        $a[3] = $total_price; // dirty hack to make coupons working!
        return array($a, $p, $t);
    }