connect subscription to store database

e sell digital software that is linked to a database in order to trade the licenses. We are considering changing our one-time payment to subscription mode. To do this, we would need an app that is able to connect to our database and automatically push back an expiration date (basically extending a subscription by 1 month means that 30 days have to be added to the license). Can we do this with your app? We use the database structures from Firebase.