The process of setting up in app purchases (IAP) is pretty simple.
First, you need to create an Apple ID. If you don’t have one already, go to appleid.apple.com and follow the steps.
Next, log in to iTunes Connect with your new Apple ID and click on “Manage Your Apps” link on the right hand side of the page.
Click on “Add New App” and create your new app by filling out all required fields. This includes providing a name for your app, selecting a primary language and bundle ID, assigning it to a pricing tier, etc. You can also upload screenshots or change your app’s description at this time – just remember that all fields marked with a red asterisk are mandatory.
Now that you have created an app record in iTunes Connect, you can create specific versions of it for iPhone and iPad (if necessary) as well as your in-app products.
To do this, click on the “Manage In-App Purchases” button under the application record that you created earlier in iTunes Connect. Then select the “+” sign at the top left corner of the page to add a new in-app purchase item to your app.
You will then be prompted