{"result":"failure","messages":"<ul class=\"woocommerce-error\">
\t\t\t<li>
We were unable to process your order, please try again.<\/li>
\t<\/ul>
","refresh":"true","reload":"false"}
I know this is from the Woocommerce/include/class-wc-checkout.php file.
I found some links related to my question, but they haven't solved my issue.
Woocommerce plugin gives 'We were unable to process your order'
https://support.woothemes.com/hc/en-us/community/posts/201888769-checkout-fails-to-submit
Please let me know if anyone has any idea about this.