How to transfer golf clash notebook from android to iPad
I’ve already purchased the app on my android now they want me to pay for it again on my iPad
Very possible. Android and iOS/iPadOS are different hardware platforms.
As App Developers must develop their Apps for entirely different platforms, it is not unusual for a Developer to require that you pay for the App of each supported platform upon which you wish the install the specific App.
In some cases, an App Developer might offer a "Universal App" - where the licence covers multiple OS platforms.