Hello, I'm trying to use the "transformBatch" transformation but am having trouble figuring out under what conditions/for what events it gets called. Do my events need to have any specific properties/use a specific API?

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You should use the

transformBatch

function when you want to apply a transformation to a batch of events, especially when performing aggregation or roll-up operations on the batch. However, it is highly recommended to use

transformEvent

as much as possible, as it ensures event ordering. When using

transformBatch

, make sure you pass the

messageId

from the input event to the output event to ensure event ordering, as RudderStack does not guarantee event ordering without the

messageId

. https://www.rudderstack.com/docs/features/transformations/cloud-mode-transformations/#applying-transformation-on-a-batch-of-events