1. Consumable

• For comumable items like , currency in a game.

2. Non-Consumable

• Purchase once and keep forever, eg : remove add from a free game

3. Auto-Renewable Subscription

• Monthly subscription based service.

4. Non-Renewing Subscriptions

• Service not possible to renew, like season pass for some app.

Following items are necessary

1. Real device to test
2. Paid developer account

• Define purchase in iTunes
• Load all the reference name from purchanseble items in application
• Fetch product info for all of those items
• User buys product
• Process transection response
• Validate the receipt
• Uplock the content
• Finish the trancsection

• Login to your paid developer account from Apple (https://developer.apple.com/)
• Create a new appID (Certificates, Identifiers & Profiles > Identifiers > App IDs)
• Now login to (https://appstoreconnect.apple.com/)
• Create an app (My App > + > new app)

• Now login to (https://appstoreconnect.apple.com/)
• Go to myapp and select your app
• Click Feature > In-App Purchases > Click + sign > Any of the subscriptions type Note : Product ID have to be unique (Eg: Bundle ID + Extra)

• Now login to (https://appstoreconnect.apple.com/)
• Go to Users and Access tab
• Click Testers under Sandbox group
• Create a sandbox account with necessary informations (the email address should be and paid/unpaid apple id)
• Check your email to verify the id

• Configure the bundle identifier (Create a XCode project and ensure your have same build id which you have used in developer.apple.com )
• Enable in app purchases in the capabilities tab