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Here's one for you...suppose a user is in the middle of a Drip Campaign, and fills out a form on our target landing page during this Drip Campaign. How would the process work in order for us to stop their Drip Campaign once such a form is filled out?
To stop a Drip Campaign for a subscriber, you'd need to 'unsubscribe' the subscriber.
So when the user fills up a form to signup to another list, also call Sendy's 'unsubscribe' API (https://sendy.co/api) to unsubscribe the subscriber from the list where the Drip Campaign is setup.