A tracking number is a piece of tracking information requested by Paypal so that the customers can track an order after they bought a product and made payment via the Paypal payment gateway. 

Paypal is increasing its number of users every year, it is a way for users to pay, receive money online, and for businesses, it works as a payment gateway to accept payment from customers around the world. Knowing which type of Paypal account you should choose before opening an account is crucial to take advantage of its benefits.