To have paypal buy now buttons on your website like the one displayed below:
Just follow the steps shown in this video:
1. Goto www.paypal.co.uk and login using your paypal username and password.
2. Select the merchant Tools tab at the top then click on 'Sell single items', under 'Start accepting payments' on the left hand side.
3. Select Scenario 3. I want to sell one item at a time on my website.
4. Enter the details of your product and click 'Create Button' at the bottom of the page.
5. Once you have your buy now button code simply copy and paste into the body area of any page or quick link from within the Toolkit (using HTML view) or email support with the code if you need any help.