I have only integration with woocommerce
– paypal
– stripe
– mailchimp
– google analytics
I found this topic
https://wordpress.org/support/topic/getting-http-403-and-http-400-responses-when-submitting-form-or-refreshing-nonce/
and i used the code shown at the bottom and now the form works
I have the same problem.
In my case the problem is contact form 7 with woocommerce.
Deactivating woocommerce contact form 7 now works.
