Door Sensor Setup

Hello, I just purchased a door sensor. I’d like to monitor my front door being openedand closed. I don’t have a base station. Do I have to purchase of a station to be able to connect the front door sensor? I only own an indoor Ring stick cam and now the door sensor. Let me know if I need to have the alarm system in order to use the door sensor. When trying to set up the door sensor on my Ring app, there are no options for this, only an option to set up a homebase for the alarm system.