PayPal Plugin for WordPress
One of the ways to add PayPal functionality to a WordPress website is by making use of a plugin. This method works best for multiple products. Download this plugin from wordpress.org http://wordpress.org/extend/plugins/wordpress-simple-paypal-shopping-cart/.
Next, install the plugin by navigating to “Plugins” in the left column of your WordPress menu. Upload the plugin by selecting the plugin from the location where you saved it on your computer. Click “Open” then “Install” and WordPress will install the plugin in a few seconds.
You should get a message informing you that the upload was successful. Activate the plugin and in your list of plugins, you should now have “WP Simple PayPal Shopping Cart”.
Next, navigate to “Settings” on the left hand menu and select the plugin you have just installed. This is where you configure your shopping cart. Enter your PayPal email address (the PayPal email address where you would like to receive payments). Also, take note of the “trigger text” under “Usage”. i.e., [wp_cart:PRODUCT-NAME:price:PRODUCT-PRICE:end] and [show_wp_shopping_cart]. You will need this text in the next stage. Scroll down and click “Update Options”.