Click checkout will auto return to cancel page.

@lmn40227 Do you have logging enabled? Can you check and share the last few logs for 21sth July? There appears to be a conflict between the plugins and/or themes that you have installed, as we’ve not received reports of this issue from other users/customers. Additionally, we attempted to reproduce this issue using our testing environment and things are working as expected. Please try the following debug steps:

1. Check your site’s PHP version and make sure that it is 5.6 or above
2. Disable all plugins with the exception of WooCommerce and PayPal for WooCommerce, and determine whether or not the issue is still occurring
3. Re-enable additional plugins one by one, testing after each add-on is enabled, in order to find the culprit

If, after disabling all additional plugins, you are still seeing the same issue, then switch to basic twenty theme with both WooCommerce and PayPal for WooCommerce enabled and then check once again.

Please follow these steps and let us know your results.

Thank you!

test with Twenty Fifteen template with only woocommerce plugin and paypal checkout plugin.

still the same.

is that possible cause the problem by nonce ?

my another plugin “review pro”, once leave the review, it only update the nonce value, it’s same for that plugin too(test with Twenty Fifteen template with only woocommerce plugin and pro review, still have problem).

before those problem happens, I try to move comments from old website to new website.

I am sorry, Are you using PayPal express Checkout plugin and not PayPal for woocommerce? Can you verify the author please? I believe that is a different plugin that our.
Please check that and let me know