Temp data question

I am wondering what is the best way to handle this situation.

 

I have a registration form where user enters all their info and selects an option for membership level which sends them to PayPal to complete the signup process.

Problem:

If user fills out the form, validates, it saved the new user but at PayPal they cancel the transaction so they now have an account with no access since they cancelled.

 

I figured the best way would be save that data to a temp table and when the transaction is complete pull that temp data then save the user info creating the actual account.

 

Ideas? Suggestions?

 

Thanks

 

Dave