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Unable to buy campaign with Google Play credit
I get the message that Google Play credit is unavailable for this purchase, although my credit is more than enough to pay for it:


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Are there maybe parental controls or something else in your profile that might prevent purchases from being made?
I would recommend to submit a ticket so we can keep track of the issue.
Support won't necessarily have a solution however, and you might need to choose another form of payment, I am sorry.
We need to assess is this happens to other players as well.