Your PayPal ID is the email address that you used to sign up and log in to your PayPal account. To receive funds using your PayPal account, you can ask the sender to send the payment to the confirmed email address registered on your PayPal account. Once the payment is sent, you will receive an email notification. If you need to find your PayPal Merchant ID, you can go to your Account Settings, click Business information under "Business profile," and youll find your ID next to "PayPal Merchant ID".