the apple id you entered couldn't be found or your password was incorrect

Question

I am debugging my in-app purchase on ipad ( ios 7.0.3).

But when I enter my password, it always says "the apple id you entered couldn't be found or your password was incorrect".

1. my developer id and the apple id registered on this ipad are different.
2. when I intentionally enter wrong password, it displays a different message "Your Apple ID or password is incorrect".
3. My in-app purchase is in review state. But I feel, it doesn't have any impact on sandbox testing
4. I have restarted my device. I can use the same password for downloading/purchasing other apps from itunes.

I am not posting my in-app purchase code as this is out of our coding context.

Answer 1

In order to test in-app purchases before they are approved, you have to use test users, which you can create in iTunes Connect.

Once you sign in to iTunes Connect, you click where it says "Manage Users", which will let you create test users. Once you create a test user, you can use it within your development build of your app to test your in-app purchases. You can also create multiple test users if you need to repeatedly test non-consumable in-app purchases.