Invalid return payload: enable debugging to examine incoming payload (XML error at line 1, check URL) (Error code: 2)

[mixfreak]

Hello,
after the installation of the plugin "WooCommerce Klarna Gateway v2.0" we entered the “Eid – Germany ” and the “Shared Secret – Germany” with the help of the Klarna support.

Now, if we generate an ordner, we geht the error message:

“XML-RPC Fault #2: Invalid return payload: enable debugging to examine incoming payload.”

The Klarna support cannot solve the problem.

WP Version: 4.5.2
Server Info: Apache/2.2.31 (Unix)
PHP Version: 7.0.6
MySQL Version: 5.5.48
WC Database Version: 2.5.5

When i go to xmlrpc.php the browser shows: "XML-RPC server accepts POST requests only."

Has anybody an idea. ?

[ildar-aim]

We have the same issue issue.
Invalid return payload: enable debugging to examine incoming payload (XML error at line 1, check URL)

[isdn]

Hello,

We have received the same error.

When I logged the XML response from Klarna, it was the following:

<!--?xml version="1.0" encoding="ISO-8859-1"?--><methodresponse>...</methodresponse>

the XML header was commented out there for some reasons, and this might be related to the issue.