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The code is the same of readme in the boundle, for configurating the ipn i tryed this way: using notify_url and setting the IPN Endpoint in the sandbox account, but looking in the ipn history, there's no request. The backend part is working correctly, because with the ipn simulator i got the request.
P.S. I don't know if is normal , but using the sandbox account, i can't see any transaction between the 2 sandbox account (business & personal)