Hi,
Could you please submit a ticket providing access to your store so that we can check your setup and investigate it?
Hi guys,
We will upgrade the API plugin to nopCommerce 4.30 as soon as we have the time to do so.
Since it is a free plugin that we have contributed to the community you have the full source code of the plugin and you can try upgrading it.
Actually there is already a version of the plugin that has removed the OAuth 2 part of the plugin со you can give it a try.
Please see this issue for more information.
If this version is good then we can merge it to the official plugin for 4.30 and build on top of it.
<add name="X-Frame-Options" value="SAMEORIGIN" />