Just downgrade your extension version to 2.3.3.
Magento 2.3.5 contains minor backward-incompatible changes.
Tried ordering both as a guest and as a logged-in user. Version: 2.3.2. Mode ( Magento): Production Mode (PayPal): Test. Browsers: Chrome, ...
I tried another file and no luck.
hangs right after the user enters their credit card and clicks place order.
Some information good to know: I "successfully" ported a Magento 1.7.x
Try submitting the file again with the network window opened (F12 on Chrome) & search for the request to see if there are any visible errors. I had a similar issue ...
let hang Checkout Page Preconditions Centos 6.7 Final Plesk 12.5
UPDATE. It seems like updating Firefox to 46 fixes the issue! Original investigations. As I'm also facing this annoying problem I decided to give ...
We look at how Magento cookies can create issues with login functionality, and