The "API Authorization Error" in general means that OptimizePress is not able to communicate with the email marketing service. This could mean that your integration authorization or API keys are no longer working, or the more likely cause is that a plugin on your site could be blocking the WordPress Rest API.
The WordPress REST API provides an interface for applications to interact with your WordPress site by sending and receiving data as JSON (JavaScript Object Notation) objects. It is the foundation of many features in WordPress such as the Block Editor.
OptimizePress relies on the Rest API to be functioning normally in order for optin and checkout forms to work properly.
If you are using Security plugins or other plugins that have controls for disabling the Rest API, you'll want to check the settings in those plugins to ensure that the Rest API is not being blocked.
The following plugins may have optional settings enabled that are blocking the Rest API if you are seeing that error on your optin forms or similar errors on checkout forms.
iThemes Security Plugin
WordFence
WebARX
Perfmatters
There are likely other plugins or security/CDN services (such as Cloudflare and Sucurri) which may also be able to block the Rest API.
We know there are some security concerns with having the Rest API open, but some plugins that integrate with 3rd party services such as OptimizePress, contact form plugins, cart plugins (such as WooCommerce and OptimizeCheckouts), would require the Rest API to not be restricted as much.
We would suggest working with your web host, 3rd party security or CDN, Caching plugin, or Security plugin to check for any settings that could be breaking the Rest API and ensure that those are activated so your forms will work properly. Most likely if you are having this issue there are probably other services or plugins on your site that may not be working properly.
If you have any questions about this or need further help please reach out to our team for assistance and we'll do our best to guide you further.
