Hello,
Thank you for the interest in the exchange extension.
I see that the HTML output for the plugin’s UIs are minified/tidied. This is cool, but the plugin relies on HTML comments to function.
If you can, allow HTML comments in your minifier plugin. If there is no such option in the plugin, disable the minifier althogether and try again. If you are unsure which plugin does HTML minifying, try disabling other plugins until you find it.
There may be other issues with your site, or not, but this is definitely something that would cause issues.
The good news is that your JSON API is working fine.
Please let me know if you found how to not remove HTML comments from the output, and whether you encountered any other issues.
with regards