I am have a similar problem, I have recently set up with Alertpay, installed the module v1.2, seemed to be working fine, copys all the items in the shopping cart to the Alertpay payment page, but if there is free shipping, the alertpay payment page cant handle it for some reason. I just an error saying the amount has to be a numeric value.

I think the problem could be solved by someone who is a but up on php (its a but out of my league) if they could make the module send 0 (zero value) as a numberic value, becuase Alertpay page seems to think there is no value at all.

I offer free shipping with orders over 65 euros, but if I use Alertpay as a payment option I cant give that offer.

Also, one other thing I noticed while testing, is that if you have items with tax (VAT in my case) the module only sends the amount before VAT is added, so if I have an item that is €10 + VAT @ 21% = €12.10, It will only show as €10 on the Alertpay payment page.

So, I was wondering if anyone else had the same problems or if someone is already noticed and in the process of updating the module.?

Cheers

DB