Andrew,
The plugin allows only one locale at a time. Meaning, that if you set it up for US, it will only display US links (there is no geolocation to detect the user’s browsing location).
This is for several reasons – the main one being that most ASINs are only valid for the locale they are used from. So an ASIN for a book in the US, may not be a match to the same book in Amazon.it, for example. So you would need to have the correct ASIN for each locale if that were the case. The second reason, is that (like I mentioned) the plugin does not track/determine the user’s browsing location, so there is no way to tell where the user is from.
You can, however, manually add a new locale to shortcodes if you want to – but again, it would be up to you to decide where and when to show these products as the plugin cannot geo-locate anyone. This is done by adding the parameter locale="co.uk" to the shortcode like so:
[AMAZONPRODUCTS asin="B0084IG8TM" features="1" locale="com"]
or
[AMAZONPRODUCTS asin="B0084IG8TM,B005LAIHPE" locale="com" partner_id="mynewid-20"]
or
[amazon-element asin="0753515032" fields="title,lg-image,large-image-link,button" locale="com" partner_id="mynewid-20"]
Keep in mind that you may also need to add the partner_id (and in some cases the Access Key and Secret Key for some locales), as they are usually different for each locale.
Some locales also require you to reside in the locale that you are using the API for, or it goes against their terms of use policy (for example Amazon.in requires users for Amazon.in actually reside in India to be able to get an affiliate account).
Warm regards,
Don
