VS 2008 Question -Paypal Payments/Donations in VB .Net

Hi,

I was wondering if I were to start a new project in vb .net would i be able to have say a user log into the application were their creditionals are stored in a access database (containing their username, password and their payment status) or wherever. (I can do this part easily).

Then have a paypal payment option within the application so a button saying Pay Now or Donate Now, were upon paying the users payment status in the database is changed to 'paid'. I'm sure that if i were to do it through paypal it would send you to their website because of privacy and security.

What I don't understand is how would i be able to send the user from my application to the paypal website and upon paying, have the paypal website return to my application saying that they have paid and the money has went into another paypal account?

I'm not quite sure which direction to head, I've checked the paypal sdk's (https://cms.paypal.com/us/cgi-bin/?c..._download_sdks) but not sure which I should be looking at.

Has anyone tried this, or have utilized the code for a purpose like this?

Thx any help appreciated.