send http post after successful paypal transaction

[gbuser]

Hi,
I'm selling a third party prepaid service and I'm using Paypal to collect the funds.

After I process a successful Paypal payment for a customer I need to redirect the user back to my site (I can set this in the Paypal settings) and I also need to send an update to the third party website of the new customer credit.
The third party site accepts the update by HTTP Post and will then update the customer's account details there.
The HTTP Post URL needs to contain: <my company id>, <my password>, <the customer id>, <the amount they paid>.

Any ideas if Virtuemart can help generate that URL and post it on the successful completion of a Paypal payment?

Thanks a lot.