I bought the app for my Android device. How do I switch it over to my new iPhone?

Unfortunately, apps purchased from Apple and Google Play are separate products, each based on its own proprietary software, and there is no way to transfer the apps between platforms. Apps purchased from Apple will not work on an Android/Google Play device, nor will Android/Google Play apps work on an Apple device.

If you switch from an Android phone to an iPhone or vice versa, you will need to repurchase the app.