That will depend on the hack you are looking for...please be aware that hacking in app purchases (anything that can be purchased with real money) is not allowed to be discussed or posted on xda. Hacking in app purchases is considered warez and is agains xda rule 6: Do not post warez.
If a piece of software requires you to pay to use it, then pay for it. We do not accept warez and nor do we permit any member to request, promote or describe ways in which warez, cracks, serial codes or other means of avoiding payment, can be obtained. This is a site of developers, i.e. the sort of people who create such software. When you cheat a software developer, you cheat us as a community.
Thanks!