1. A mobile app which has been built for testing
Please refer to this guide for more details https://help.dropsource.com/docs/documentation/after-dropsource/publishing-your-app/submitting-an-ios-app-to-the-app-store/#:~:text=Archive%20your%20App,Click%20Validate%20App
Please select Ad Hoc instead of the iOS App Store if you just want to test this app from the local machine.
2. Developer Account when building Xcode
3. Set up the environment for mobile testing