iOS App Template Configuration and Deployment

I'm seeking assistance with configuring my iOS app template, integrating specific features, and preparing it for submission to the App Store.

Key Requirements:
- Add User Login functionality
- Implement Push Notifications
- Set up In-app Purchases

Ideal Skills:
- Proficiency in iOS app development
- Experience with App Store deployment
- Familiarity with integrating user login, push notifications and in-app purchases to an app

Please note, the existing app template does not require any UI/UX modifications. The focus will be on feature integration and app configuration.