If you want to offer subscriptions through in-app purchase on Apple you will need to create an offer in the store and match it with an offer in the Magine Pro Console.
Before you can sell offers through Apple you need to sign an agreement with Apple and fill out tax forms. All IAP offers are reviewed by Apple. If you are setting up your IAP offers for the first time you will need to release the offers together with an app release.
If an offer is visible in the app depends on the visibility of the offer in the Magine Pro Console.
APPLE STORE CONNECT
To create an offer in Apple Store Connect, head to https://appstoreconnect.apple.com/, and do the following
Select your app
Click on App Store
Select features --> subscriptions
If this is your first subscription offer start with adding a subscription group. Otherwise click on an existing subscription group
Click on the blue plus button to add a new subscription
Add a reference name
Add a unique Product ID and copy it
Select a duration period. The app supports monthly and yearly renewal periods.
Select a price and click save
If you want to offer a free trial or a discounted introductory price you can now click on "View all subscription pricing"
Select introductory offers
Define the countries
Set a start date and/or end date if applicable
Define type: upfront payment for a defined period, discounted price for a defined period or free trial
Define the duration and pricing if applicable
Adjust local pricing if necessary
Add app store information
Add offer review information (screenshot of details page with purchase button and test account credentials)
Save the offer
Everything is now created on the Apple Store side, head to Console Integration part to connect the offer to Magine Console, which is the last step to get it fully operational.
Billing grace period, Non-Renewing subscriptions and Family sharing aren't supported.
Make sure when releasing your 1st IAP offer:
select the latest available build
add the IAP subscription on the iOS App (new version to submit)