'Magento 2 Guest Checkout is disable but still getting spammed with failed transactions checkout via guest

I am having hardtime with a Magento 2 at my work where occasionally got spammed with hundred of failed transactions in a short amount of time checkout with a 3rd party payment gateway.

Guest Checkout Feature is already disabled but somehow the log shows that the failed transactions were checkout as guest.

Does anyone know if there is any method the hackers use to spam orders on Magento 2?

Magento Version: 2.4.3-p1

Default Luma Theme

Thanks

magento2

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'Magento 2 Guest Checkout is disable but still getting spammed with failed transactions checkout via guest

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