If you're an iOS user who cannot make a purchase, please check the following:
Is this a new game update?
If yes, then live sales have to be verified before release on the AppStore. It might take some time, but everyone will see them in the game once confirmed.
Is your Subway Surfers account part of iCloud Family Sharing?
There might be some limitations set for you by your parents/guardians that may affect the game purchases. Check more here: Apple Support - Family Sharing.
The most important is to ensure your device payment method is up-to-date and connected to the Apple ID. By the way, a stable internet connection is mandatory to purchase items.
We don't recommend uninstalling the game to fix the problem. Please get in touch with us by 'Submit a request' below if you need additional help. Don't forget to provide a screenshot, as it will be very helpful.