What does the message “An error has occurred; please try again later. If you are the owner...” mean?

The message "An error has occurred; please try again later. If you are the owner or the integrator of this website, please log into the Nexi Payengine back office to see the details of the error." is a generic error message which is returned if a specific technical issue occurs at the moment the payment page is called. We don't display the actual error on the payment page, mainly because of security reasons, but also not to confuse your customers.

In your Nexi Payengine account, via "Configuration" > "Error logs", you can easily look up the errors that occurred when the generic error message was displayed. The actual meaning of these errors are described on the Possible errors page.