I want to implement a system where if my customers balance in the website goes less than 10 it need to automatically recharged with pay pal. I had a look at paypal recurring. that was not exactly I was looking for. Automatically charge PayPal account? here you see the previous question related question. but that is not exactly meeting my requirement.
if I implement payal express check out does it work like auto recharge. because I have not found a related information
You could use Reference Transactions with Express Checkout, in which case you would send the transaction ID from a previous transaction along with the new amount you'd like to charge in DoReferenceTransaction. In order to do this you'll need to get reference transactions approved and enabled on your PayPal account for use with EC.
Alternatively, you could use the Adaptive Payments platform, which includes Preapproval profiles that allow you to charge people at any time using a preapproval key generated at the time they setup your application. This is covered in depth in Chapter 8 of that Adaptive Payments doc I linked to, and it's also covered in various other places through-out that doc.
