Activate or pause one automation workflow.
This is consequential in one direction: ACTIVATING starts enrolling contacts, which means real emails begin going out on the workflow's schedule without further confirmation. Pausing stops new enrolments. Read the workflow with get_automation first so you know what activating will actually send.
Contacts already part-way through a paused workflow are held rather than dropped, so pausing is not a cancellation. Safe to repeat. Requires an API key.
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