None. Membership in Go Rewards is complimentary and virtual. By downloading the app, you will be assigned a virtual account number and QR code which you can use to start earning and redeeming points.
If you want to avail of a physical card, you must present your valid ID and pay a minimal fee of Php100.00 at participating Go Rewards partner stores. You may check this article to learn how to join Go Rewards.
How can I join Go Rewards?
What is Go Rewards?
What happens if I don’t use my Go Rewards account?