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Pro plan. Keap works through a connection and HTTP steps, which are part of Pro and Agency (and the free trial). Anything you already have keeps working on every plan. See Plans and billing.
A contact who replies leaves the campaign (the When the contact replies box). Add Send to another campaign in that box and pick a follow-up campaign. There, a Webhook / HTTP step creates the contact in Keap, where your Keap automation takes over.
How it connects: Keap’s REST API with a Personal Access Token or Service Account Key in the X-Keap-API-Key header. See Keap’s developer portal and its Postman quick start. The request below follows Keap’s v2 contacts docs; check the answer on your first real call.

Before you start

  • Keap plan: tokens have per-second and daily call limits (Keap’s developer docs). One call per reply stays far below them.
  • A token: create a Personal Access Token in your Keap account’s API settings, or a Service Account Key (it belongs to the Keap app rather than one person).

1. Connect Keap

In Kerux, open Integrations > Connections, click Connect on Custom API (under Developers):
  • How it signs in: API key in a header, Header name X-Keap-API-Key, paste the token.
  • Base URL: https://api.infusionsoft.com/crm/rest
Click Save, then Test connection.

2. Create the contact

In the follow-up campaign, add a Webhook / HTTP step named keap:
Keap answers with the new contact, including its id. Open the contact’s journey after the first test to copy the id’s exact path for later steps. To start a Keap automation, have it start on new contacts from this source, or apply a tag with Keap’s tag endpoint in a second step.

Test with one contact

In the follow-up campaign’s Builder, click Test to open Test on one contact and check the contact in Keap.

Common errors

The token is wrong or expired, or the header name isn’t X-Keap-API-Key. Create a new token and edit the connection.
The token hit Keap’s per-second or daily limit. Kerux retries later on its own.
The email is invalid or missing. A step whose email is empty waits instead of sending.
Related: Webhook steps, ActiveCampaign, HighLevel.