Okay, I think I've found the problem:
I have to accept the payments in my PayPal account so that chipin can update the widget.
The problem is PayPal wants to get some payment fees.
For example we would get $47,75 instead of $50,00.
That's not good.
It seems that these payments are not marked as a donation.
I would like to send back the money. And create a new button which is donation and not payment.
What do you think?
Any news from the official maemo.org paypal account?