iOS 13 - How to login in in-app purchase Sandbox account?

Question

In order to test my in-app purchases with iOS 13 I have to update one of my test devices to iOS 13.1 beta.

On iOS 12 and before there was a special Sandbox login in <

Answer 1

The following worked for me on ios 13:

Settings -> iTunes & App Store -> Scroll all the way down and click on "Sign In" under the "SANDBOX ACCOUNT" section