PayPal is the very secured and fastest way to transact online. But Did you know How PayPal Works? Here is the answer. For Example you want to send $100USD to your friend. If you have balance in PayPal account you can transfer directly from your PayPal account to Friend PayPal account.
If you don’t have enough balance in your PayPal account you can transfer funds from your bank account or credit card to your PayPal account and then transfer to your friend account or to shop online. Below video shows you how PayPal works.
To receive Payment from someone else to your PayPal account as same way, May the Payer who can transfer funds directly from his PayPal account to your PayPal, If payer does not have enough balance in his PayPal account First he should transfer funds from his bank account or credit card to payer PayPal account then transfer funds to your PayPal account. Then you can withdraw funds through your credit card or you bank account just transfer from your PayPal balance.