Paypal is a payment service provider (PSP) which is used in online commerce. It can be used to pay small and medium amounts when buying and selling. If you want to use Paypal as a PSP, you can find the necessary information for registering a Paypal account and using it with the Frisbii Media account here: Create a paypal sandbox account & Step 2: Link your PayPal account with Frisbii Media.
Further information on PayPal, the options and conditions can be found on the PayPal website at: https://www.paypal.com/