Hi
All In-app ids should be added to your app store and play store developer console.
If it is added properly, then won't be the difficult task to add code.
Relevant Skills and Experience
9+ Years in Game development
Tools: Unity3D, cocos2d-x, Sprite-Kit
Skills: C++ , C#, Java, Obj-C, Swift, Javascript
Proposed Milestones
$100 USD - add in-app code in project.