With each purchase, you get the complete source code of the app starter in a Zip file. You can make modification to the source code and make your own app(s) as per the license. Check the licensing terms and conditions at Licensing page. What you will get is - all the source code of the template ready to be used. This way we make sure you can customize as much as you need.
You also get the setup instructions saved within the source code, generally in an README.md file.
For our best-selling apps, we also have complete documentation for setup and modification.
Also, for our best-selling apps, we have feature videos showing all the features of the app, as well as videos explaining the setup and modifications steps (for some of the apps)