Credits have a validity period of 60 days, so make sure you use them in time! The expiry date is noted in the My Credits section of your account.
NOTE: The expiration date is set for Central European Time (CET), so make sure you redeem your credit(s) at least 1-2 days earlier when you’re in a different time zone so they don't expire before you get to use them.
Any further questions? Please contact Customer Support as they're always ready to help!