This video shows how to invoke a REST API from the Server Code script. There are a number of benefits to invoke a REST API from the server instead of directly from the client:

1. JavaScript is the language used to write the script
2. Additional business logic can be added around the API. For example, in addition to sending an SMS, you can also send an email (SendGrid API)
3. The API keys and tokens are secure
4. Script is exposed via REST API (to be invoked from the app)
5. Script has API to access Appery.io Database, Push
6. A script can be saved as a library and used in other scripts
7. Script changes can be made without updating the client (app)