Rails - Jul 2006 - Has anyone managed to get the Paypal plugin to work?

Is there anyone out there who has managed to get Paypal immediate 
payment notificiations to work with the Paypal plugin?

I can get as far as making the payment in the sandbox, but can''t get
any
acknowledgement back to confirm the payment was made.

I''m confised as to how Paypal will know where to send the 
acknowledgement as I''ve not supplied my IP address or anything like
that
to say where the response should go.

--John

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