Why did PayPal charge $1 to my credit card?

If you recently updated or edited your credit card information or added a new credit or debit card to your PayPal account, a temporary charge of up to $1.00 USD may appear in your transaction history to verify that your card is open and in good standing. The charge will appear as ‘pending’ and is automatically removed after we have verified your card. 

If the charge remains on your card after 30 days, contact your card issuer.