Checkout / payment query with free order?

[thejungle]

Hi!

 

I'm using 2Checkout.com and I think it may happen with any payment option. I want to give certain customers a free item - including shipping.

 

I've created a coupon for 100% and made the weight of the item so low and set a weight shipping level cost at $0, so when OSC totals it all up it comes to $0.00.

 

How can I stop ot passing a nil amount order to 2Checkout.com for processing - as 2Checkout.com says `No' - or rather `Invalif Parameters'.

 

Any ideas?

 

Thanks

Ernie