PayPal's Merchant Gift Certificates can be applied towards a purchase with the designated merchant at any time.
Security is a top priority at PayPal. When redeeming a gift certificate, you may be required to provide a valid credit card or bank account for identification verification purposes only. There is no fee for applying a secondary funding source.
If you do not have access to the email account the gift certificate confirmation was sent to, contact the purchaser to have it canceled and reissued to the correct email address that is associated with, or will be added to, an existing or new PayPal account.
Make sure your browser's settings are set to print the images of your gift certificate.