I’ve paid for the app
and use on my iPad. However I would also like to use on my iPhone. Is this possible or do I have to pay for a new version on every device.
my iPad is old and only runs stage traxx
my iPhone X only allows me to download stage traxx 3
You only need to buy the in app purchase once and can use it on all devices running under your Apple account. To unlock the full version open in app purchases and tap on "Restore purchases".