How can I get Shared Secret key for In-App Purchase?
Follow below mentioned steps to get Shared Secret key for In-App Purchase:
Begin by logging into your Development account, which can be found in your iTunes Connect page on Apple’s website.
Once in, find the My Apps application tab.
All of your created applications will appear here.
Select the features tab. Underneath the features tab are your in-app purchases.
Within your in-app purchases page, select the App-Specific Shared Secret link.
A pop-up window will appear and select the option to Generate an App-Specific Shared Secret.
Once said Shared Secret is generated, you can now locate the Shared Secret key.