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Pro plan. HTTP steps and listeners (call, wait, continue) are part of Pro and Agency (and the free trial). On Starter, a campaign that already has one keeps running it and you can still edit its other steps; adding or changing an HTTP step shows This is part of Pro with an Upgrade to Pro button. See Plans and billing.
Integration steps can go anywhere in a campaign, not only at the start. A contact can call a service, wait for its own answer, and continue using that data in the next steps.

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The four steps

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Set up Wait for webhook

1

Add the step

Click + where the contact should wait, open the Automations tab of Add a step and choose Wait for webhook.
2

Tell the other app where to send

Each contact can get its own link ({{listeners.<step>.callback_url}}), or all contacts share one link and Kerux finds the contact with a field you choose (for example the email).
3

Listen for a test

Click Listen for test event and send one from the other app. Kerux shows the data it received: click a field to use it in later steps. See how to write an app’s answer as a variable in the Variables reference.
If the data arrives and Kerux can’t tell which contact it belongs to (or it matches more than one), nobody continues by mistake: it goes to Home > Tasks so you can assign it.

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Common problems

The other app hasn’t answered yet. The contact continues through timed out when the time limit passes.
The contact stops with the service’s error message, visible in Home > Tasks with Retry. It never shows as finished when something failed.