monetization development in an native mobile app and website

I am looking for a full stack talented freelancer to help me with the monetization of my existing mobile and web applications. I have an Android App, iOS App, and a website that I need to have monetized. My objective is to take advantage of an In-App Purchase model of monetization and I have a budget set aside for this purpose. I am looking for an experienced freelancer who understands the complexities of monetization and possesses the necessary skill set to get the job done quickly and efficiently.