There are many number of apps in App store these days & with every new app being introduced in store but it’s been a pain to buy In-app purchases in our favorite apps.
But here is the solution for all that. By this you can get all the in-app purchases for free. First thing you need to do is jail brake your IOS device. Don’t Jail brake when you buy it, wait for the warranty to end then jail break it.
After that follow the procedure listed below in infograph. One thing is that this will not work for all the apps but will work for most of the apps in App store. Just try it out to check.