Hi,
In your first message (
www.hikashop.com/forum/payment-methods/8...failures.html#301192
) you said that you were able to reproduce the problem while on the phone with PayPal support.
Are you still able to reproduce the problem ? If so, what is the exact error message that you get ? Could you also provide a screenshot and URL of the page where you have the error ?
Without that information, I can only speculate, and it could be anything really. It could be some faulty cluster at PayPal, but normally, in that case, it should quickly go away as they fix their infrastructure.
Also, you said that they were working on the issue when you had them on the phone. I suppose that they didn't know what they were talking about and just gave you a standard message without really looking into it ? Or did you get back any information from them after that ? It's been one week, if they were working on the problem, they should already have fixed it by now...
Also, if you contact their support again (which I recommend), you should ask them to speak to a tech support who can look at the logs, and you can provide him with the exact error, the URL, the screenshot (like I asked above) so that they can look deeper into it, because the first level support can't really look into that kind of problem on their end...