Hi, 

So, I had a webshop that worked fine, suddenly, this issue comes up. 

Server Error
We are not able to process your payment.
The cart has been updated. Please refresh the page.

When someone tries to order something, chooses a delivery method (there's only one); the error occurs. I tried deleting and adding the delivery method, it works for 2-3 times and then the error returns...

Can someone help me? I'm on the Odoo online instance... 

Thanks