there are two types of short codes :
On Demand Shortcodes
This type of code is used when you need to reply to clients one time. A client sends a message and receives a reply and that's it. Hence the name On Demand(i.e send messages On Demand)
As the name suggests the client only sends a message once and they get subscribed to your service. i.e they receive messages from your code daily or weekly or as you specify.
For any further information please reach out to us on email@example.com