Only your phone number is linked to your Green P Mobile Pay account for security and verification reasons. If you don’t have your phone with you, make a payment at the pay-and-display machine and place the receipt on your dashboard as proof of payment. Alternatively, if you’re with someone who has a Green P Mobile Pay account, they can pay for your parking by simply adding your license plate number to their account. They can remove the plate from the account after the transaction is complete.