Yes you guessed it PayPal integration -!Sigh!

I've setup IPN with "generate username/password" on my account and can recieve the IPN message on the backend but what I want to do is use the username and paswrod that is generated with the microsoft membership database. I thought I'd just use the CreateUser api call to generate a user in the database but the password returned from PayPal is already hashed? This obviously makes sense but I don't know what to do with it now. I tried using the same user details through the CreateUser api to see if it created the same hash in the database but it doesn't so I can't just insert the already hashed value direct into the database. Has anyone else got any suggestions on how I should go about doing this?

Cheers
Phill