It is similar to a twitch subscription, which when extended, triggers a message like:"Patreon X has been a Patreon for Y months". In order to be able I have to figure out if that is even possible and if so I have to write a function that is using it.
Just wanted to inform you about it. Keep it up, take care and see you soon!
(p.s. I don't think this will be too easy :/)