Look at the IOSTapJoy plugin in Engine/Plugins/Runtime/Advertising/IOSTapJoy. You will see it adds an additional framework to PublicAdditionalFrameworks. You may also want to make a Chartboost plugin or module build file instead of adding it to Core.Build.cs. Let me know if have any further questions.
I would like to make a ChartboostPlugin but first I would like to try the TapJoyPlugin to use TapJoy.
Do you think it will be enough if I do as follows:
2.Add the TapJoy AppID and the SecretKey:
Add the following to MyProject->Config->DefaultEngine.ini:
[TapJoy]
AppID=XXX
SecretKey=XXX
CurrencyString=XXX