Prior to this feature, it was only possible to customize the "To" field in the Voice call event action, so we replicated this to all other actions.
This is useful because it allows use cases like:
- Use device_label dynamically within a Webhook's URL, which is helpful to send downlinks in many platforms, such as Particle Cloud
- Use a phone number stored in a device property or "context" field, to send a Telegram or SMS
- Use an email stored in a device property or "context" field, to send an Email
To learn more about supported custom fields, see this article: