Hi,
We are using ZC 1.3.8. and we have installed the version 2.3.7 of your module. It works for UK postage but not for International Airmail. Whatever weight I enter for the products, it always offers the same £4.25 postage (best price).

The airmail module is enabled, the Hide invalid shipping is set to "true".

What are we doing wrong ?

Can someone please help?

Thank you.