You can find the .apk in OpenParking Code/app/debug/OpenParking.apk
To build and run it, you will need to have Firebase, Google Play Services, and Google Maps SDKs installed.
You will need a Google Maps API key, which should be inserted into OpenParking Code/app/src/debug/res/values/google_maps_api.xml
You will also need a PayPal developer account, which should be inserted into OpenParking Code/app/src/main/java/com/example/openparking/Config/Config.java
Build target is currently Nougat Nexus 5x API lvl. 24