The map indicates the location of the land. The radio buttons indicate which owner is due to pay the land tax in the current year. You can send a WhatsApp to the phone number saved in Firestore (which is the administrator's phone number). The history button shows a table with the history of who has paid the tax in previous years. The manage button allows (before logging in) to edit the radiobuttons, add and delete owners. In addition, the data is taken from firestore, where a cloud function is responsible for activating the next owner each year.