helped me a lot :)

Thanks for providing a response to my question. summarization: The client that is not yet registered in our app and also does not have our app installed will receive an email In that email there will be an link After clicking on the link in that email it will redirect our client to the App Store so he can download our app When the app is downloaded user will open the app and will start our registration flow The promocode would be already filled in the promocode TextField Thanks