Error: Unable to save or update settings

If you find that you are unable to save the configuration changes in the Magento Admin for our extensions, here are possible solutions for the issue:

Flush All Caches

Be sure to clear the cache, full page cache, and your third party caching system if used after making changes.

Confirm Installation

Ensure that all files are properly uploaded and not overridden with breaking changes from customizations you may have created.

Confirm Server Configuration

Your server is only capable of handling so much data from a request. If there are too many payment methods installed on your store, you may need to increase your servers PHP max_input_vars variable. If it's at a default value of 1000, maybe try increasing it to around 10,000.

Check The Database

If after the above you are still unable to save your configuration values, narrow down where this data is going. Are your changes making it to the database table core_config_data? If you see your changes are not making it to the database, but you see older values, try deleting the older values (not the full row entry) and see if the changes save. This issue is sometimes caused when an extension was previously installed, uninstalled, and installed later in the future.

If the changes are not appearing in the database, you will want to note the time of saving and check for any errors logged to your sites logs. There may be something preventing the saving of the values in your codebase. Such logs include the exception.log, debug.log, and your server's PHP error.log.