Step 1: You will need to download Cydia or jailbreak to get it. That is necessary and do not need to talk too much.
Step 2: No matter what iDevice you are using, add the source apt.xsellize.com.
Here is a pictures for example.
Step 3: This is most improtant step to getting free gems and cash. Find and install iap cracker
Step 4: After finishing all the steps above, go to the shop and buy whatever you want and need, it really works.
Note: You will not be charged and don’t buy if it says “Confirm Payment” Because this meant it doesn’t work.