Implement Subscriptions and Consumables in iOS App

I'm on the lookout for a proficient Flutter developer to integrate in_app_purchase into my iOS application. The primary services will include subscription-based access and consumable items.

Key aspects of the project are:
* Implementing in-app purchases: The app should have a mechanism for users to make one-time purchases of consumable items and also subscribe to regular services.
* User Interaction: Users should be able to engage with both subscription plans and individual items in the same application.
* User Authentication: Purchases of subscription services will necessitate user login, while individual items or consumable purchases will not require this.

Ideal Skills:
* High proficiency in Flutter development
* Extensive experience with iOS applications
* Experience in integrating in-app purchases in iOS apps
* Knowledge of user authentication processes.

My ideal candidate has previously worked on similar tasks and can make sure these features are smoothly integrated without glitches. The user interface should be intuitive and accessible, ensuring an efficient user experience.