Are you looking to use PayPal Express Checkout feature in your Magento store, where the Paypal button shows on the cart page and the product details page as well, so that users can checkout quickly with Paypal. Easy and simple!
So, if you are facing any issues like PayPal express checkout buttons not showing, then here is what you should do.
Copy the paypal.xml from app/design/frontend/base/layout/ and paste it to your layout folder of your custom template.
And then copy the addtocart.phtml from app/design/frontend/base/template/catalog/product/view/ and paste it to your template folder of your custom template.
Refresh cache and check the website frontend now.
Article source: http://www.learnmagento.org/magento-tutorials/magento-paypal-express-checkout-not-showing/
