Sell product more then once

Is there an way to sell a product more then one time?
As i see it is only possible to sell a product once. After this, the user is not able to buy it another time.

Maybe im just not finding an option for it. Or the function comes not with parcel.
If im not too dumb to find it. It is planed for future updates?
Also to just send an Plain text as product and not an file/link?

We would like to use parcel to sell monthly memberships and credits on our site.