RobPegurri

There is no possible way, I'm afraid. You can always create a "service" product for Gift Wrapping, but the customer will need to add it manually to the cart. I've "solved" asking only for a gift message, no gift wrapping. That's sad but Squarespace is really limited from a commercial point of view.

If the cart amount is zero, there is no need to insert credit card. I use this workaround for Cash On Delivery (about that, will Squarespace wake up and implement that?).

I've created a custom cash on delivery 100% discount code, if you are selling a service (no shipping costs) you will be able to have an order created without payment  

This is ridiculous! We pay the full amount every year but essential features (such as this one) are limited to US and Canada. Why?? Just give the possibility to manually insert the ZIP codes if you don't have a database available. Simple and fast.