How to set up behavioral segmentation triggers in email tools like Klaviyo or ActiveCampaign?

Set up behavioral segmentation triggers by mapping event properties to list filters and linking them to flow entry conditions in Klaviyo or ActiveCampaign.

1. Define target behaviors – e.g., product view, add‑to‑cart, email open, link click. Record each as a custom event via the platform SDK or API.
2. Create the segment
- Klaviyo: Lists & Segments → Create List → Segment → Condition: What someone has done > Viewed Product > at least once in the last 30 days (use AND/OR for multiple events).
- ActiveCampaign: Automation → New Automation → Start Trigger → Event is recorded → select event name → add If/Else conditions (e.g., Tag is added).
3. Attach segment to a flow
- Klaviyo: Open the Flow → Settings → Trigger → select the segment you just built.
- ActiveCampaign: Drag the Start node onto the canvas, choose the event trigger, then connect to subsequent email actions.
4. Validate – In Klaviyo use Test Segment to preview members; in ActiveCampaign click Test and send a preview email to an internal address.
5. Automate event ingestion – push events from your site or CRM.

Quick comparison
| Feature | Klaviyo | ActiveCampaign |
|---|---|---|
| Real‑time capture | Webhooks, API v1/v2 | Site tracking, API v3 |
| Segment limit | 100 per account | 250 per account |
| Conditional depth | Up to 5 nested AND/OR | Unlimited nested branches |

# Example: send a Klaviyo event via Python
import requests, json
api_key = "YOUR_PRIVATE_API_KEY"
url = "https://a.klaviyo.com/api/v1/track"
payload = {
    "token": "PUBLIC_API_TOKEN",
    "event": "Viewed Product",
    "customer_properties": {"$email": "user@example.com"},
    "properties": {"Product ID": "12345"},
    "time": "2026-08-23T12:34:56Z"
}
requests.post(url, data=json.dumps(payload), headers={"Content-Type": "application/json", "Authorization": f"Klaviyo-API-Key {api_key}"})

Gotcha: Klaviyo and ActiveCampaign expect timestamps in UTC ISO‑8601; sending local time will cause the segment to miss recent events and break the trigger logic.