I've added two subscription items to my app's IAP account one for parent and other term/child sku. I added my app to Live App Testing. After downloading the app through the tester account I purchased the item and received transaction Id but If I reinstall/restart the app I get the receipt Id but with a empty transaction id.
The transaction Id is required to do the RVS of the subscribed product through IAP 2.0
Also, Is there a way to cancel test subscription? And how long are they valid?