You can pay a money request or invoice by clicking Pay Now in the email sent from PayPal Invoice.
If you don’t have a PayPal account, you can create a new account before you pay. If you don’t want to create an account, you can pay using a credit or debit card.
Check your email inbox for an email from Paypal Invoice that includes the money request or invoice.
Click the Pay Now button in the email. (If you don’t see it, click the link in the email, or copy and paste the link into your browser’s address bar.)
If you already have a PayPal account, enter your password and click Log In.
Review the money request or invoice, and then click Pay Now to complete your transaction.
To create a new PayPal account and pay using your new account, click Continue and follow the instructions.
To pay without creating a PayPal account, click debit or credit card.
According to PayPal Online Help Centre.