Cydia now allows self-service refunds within one day of purchase if the package has been uninstalled; also: the Store is now up for 9.2/9.3.
Developers will need to mark their tweaks and apps as compatible with iOS 9.2 - 9.3.3 before you can purchase them.
(To be clear: Cydia now allows developers to mark products as compatible with 9.2/9.3; until each developer does, you can't just buy stuff.)
To use Cydia you need to jailbreak. You can learn how to do that here.
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