If you're having any problems with China Payments Plugin, we recommend the following troubleshooting steps before contacting support and having us check out your site.
Ensure you're running a supported PHP version (7.1 - 7.4) on your server environment. We have plans to upgrade to PHP 8 in the first half of 2022.
Deactivate all plugins and attempt to reactivate them 1 by 1, testing the bug with each activation. A default WordPress theme should be active during this entire testing process.
Disconnect and reconnect Stripe in both TEST and LIVE modes, and independently attempt payment in both modes.
In the plugin settings, check the box in the "Other" tab to remove all data on uninstallation. Then, deactivate the plugin, delete it, and reinstall the latest version.
If you're still struggling to get the plugin working, reach out to support.