The device won't let me buy the App
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Are you not able to make App purchases from your device?
iPhones can activate or deactivate integrated purchases restriction from device's configuration. This article tells you how to activate this restriction (you will have to do the reverse process).
In Android, the problem can come from different sources. The following link can help you solve it.
Some countries do not support purchases within the Play Store. Check this link to see the supported locations for distribution to Google Play users.
You should take into account that there are smartphones in which the manufacturer disables integrated purchases to prevent possible complaints, you may have to check your support center if your purchases are locked with a password.