Klarna invoice checkout issue

Hi,

Running opencart 1.4.9.3 (not sure if opencart has stopped support for this version) and Klarna Invoice (version 1.3.6) was working fine until lately.

When user checkout using klarna invoice and enter the "Personnr" number, the javacript getaddress() function was called which initiate another ajax call to get_address of the customer using klarna API. This is now returning internal server error 500, resource not found. and the "please wait" message is displayed continuously with nothing to return.

I am not sure if the Klarna API host is still the same.
$KREDITOR_HOST = "https://payment.klarna.com";

Is someone facing the same issue? is it already found out by someone and fixed? any help is much appreciated.

Thanks
Jena