You cannot earn using paypal... Its just an online account for all your transactions ( receiving/ sending payments), also you can secure your credit card transaction using paypal.. Browse all the categories in DP forums, u may find some opportunity for earning.
Open an account with Paypal and request your sellers to send your online payments to your account. Paypal works just like a bank and helps you carry out debit and credit transactions with your funds... online! Regards, RightMan
You give your PayPal id to your customers. Ask them to send to your paypal id. Then you get $$$ in your account.