Paypal authentication is free. As long as you log in to your PayPal account and click to obtain account authentication, you can choose two methods

1 Bank authentication. Paypal, make two small payments to your card, fill them in when the time comes, and the authentication will be completed.

2 Credit card authentication, Paypal will deduct US$1.95 from your credit card for authentication, check the credit card statement, and fill in the code to complete the authentication. The money will be returned to the paypal account at that time.

So paypal authentication is free.

The key to using Paypal is to know how to use it and avoid unnecessary losses and handling fees.