We'll be implementing an In-App Purchase through iTunes Connect and create a scenario in a sample application that will call a transaction. Let's create the Product ID that will use in our In-App Purchase.
Log in to iTunes Connect. On the home page, select Manage Your Applications. Select the application you plan to add an In-App Purchase to.
Once you're on the app summary page, click on the Manage In-App Purchases button and then click on the Create New button on the top-left corner.
You will be brought to a page that shows you a summary of the type of In-App Purchases you can create. For this example, Non-Consumable is selected. We'll be creating a product that only needs to be purchased once.
In the next page is the area you fill in the information about the product. The information applies to consumable, non-consumable, and non-renewing Subscription In-App Purchases. Fill out the Reference Name and Product ID for your product...