Integration issue with Payrexx payment plugin

Hello,
we have installed the Payrexx plugin on our nopCommerce version 4.20 and after the recent Webhook update (12.10) that has been released yesterday, the integration with our ERP is no longer working.

Unfortunately, the log we can download from Payrexx admin panel does not give us much information (only Error HTTP400 --> see screenshot under the following link: https://prnt.sc/1vzjjdx  ).

We have already contacted Payrexx but they say the issue from the plugin and not their side (in fact, payments are working - just the integration to our EPR is blocked).

The plugin had no issue until Monday evening and there are no infrastructural nor network changes between Monday and Tuesday.
To be 100% sure we checked firewalls and connections, but could not find any problem on our side.

Can someone assist us on the matter?
Tiziana Scilacci

It seems to be 400 ( bad request)
While calling the API so
If possible please share some snap of code and or api which calling

Or you can please check this things
- A typo or mistake while building out the request manually, such as mistyping the API endpoint, a header name or value, or a query parameter.
- The request is missing authentication information, or the Authorization header provided could not be validated
Please double check the things and let us know

We'll also check it, thanks.