PayPal does not send the payment confirmation to store

[Doko]

I'm using the default PayPal Europe module for PrestaShop however it does not seem to be working correctly anymore. I did not make any changes etc.

After completing the payment on PayPal I am being redirected back to the shop but the process is stuck on payment confirmation script [https://store_url/modules/paypal/express_checkout/payment.php?token=XXXXXXXXXXXXXXXXXXXXXXXX&PayerID=XXXXXXXXXXXXXXXXXXX)] It just displays white screen and does not transfer payment confirmation or details to the store, so the order does not even show up in the back office. The payment itself on PayPal is going through, just the confirmation does not reach my store.

For now I have disabled ordering on the store completely. How do I fix it?