iOS Xcode App Subscription Setup with RevenueCat

I'm developing an iOS app in Xcode and need assistance with setting up a monthly subscription using RevenueCat.

Key Requirements:
- Implement a monthly subscription model.
- Include extra functionalities as part of the subscription.
- Use RevenueCat for subscription management.

Ideal Skills:
- Proficient in iOS app development using Xcode.
- Experienced with RevenueCat implementation.
- Ability to integrate subscription features seamlessly.