Error Connect with eBay

I have a client who has version WP-Lister Lite for eBay 2.8.1, he has never updated.
Your token has expired and trying to reconnect with eBay from the “Connect with eBay” button opens a new tab with the following error:

Problem connecting to eBay
WP-Lister can't seem to establish a connection to eBay's servers. This could be caused by a firewall blocking cURL from accessing unkown ip addresses.

Only your hosting company can sort out the problems causing cURL not to connect properly. Your hosting company's server administrator should be able to resolve the permission problems preventing cURL from working. They've probably got overly limiting restrictions configured on the server, preventing it from being able to do the communication required for listing items on eBay.

debug output:

EbatNs_ResponseError Object
(
    [Ack:protected] => Failure
    [Errors:protected] => Array
        (
            [0] => ErrorType Object
                (
                    [ShortMessage:protected] => 
                    [LongMessage:protected] => 
                    [ErrorCode:protected] => 90002
                    [UserDisplayHint:protected] => 
                    [SeverityCode:protected] => Error
                    [ErrorParameters:protected] => 
                    [ErrorClassification:protected] => SystemError
                )

            [1] => ErrorType Object
                (
                    [ShortMessage:protected] => 
                    [LongMessage:protected] => La aplicación API "autopiccolo.es" no es válida.
                    [ErrorCode:protected] => 127
                    [UserDisplayHint:protected] => 
                    [SeverityCode:protected] => Error
                    [ErrorParameters:protected] => 
                    [ErrorClassification:protected] => SystemError
                )

        )

)

I have checked the availability of PHP CURL and it is correct

I have tried to update the plugin to the latest version, but when updating I get an error 500 in wp-admin error. I had to recover a backup.

Thanks for the support