How to create an event trigger for when a zuora object field changes?

[Michael23]

My tenant has the Custom Event Framework activated.

I need to create event-triggers in order to generate a callout for three events:

- a rate plan is added or removed from a subscription
- the subscription end-date changes
- the end-date of a rate plan within a subscription changes

In my call to the /events/event-triggers endpoint, what can I use in the ''condition'' field to achieve this?

Thanks