Hey There, Penguins,
I have just been inform from other players about Android Club Penguin Island users not being able to use a Google Play Card to purchase a Club Penguin Island Membership subscription. Meaning that Android players must have a Debit Card, etc. linked to your Android account, to be able to purchase Membership.
A trusted Club Penguin user, Flippy received this information when asking about it in an email to Club Penguin Island Support. Thank you for sharing that information with the players, Flippy. Full image of the Email here.