How to Integrate OptiMonk with Webhook

OptiMonk's webhook integration is still here: you paste a URL on the campaign and OptiMonk POSTs the form data. It needs an endpoint you control. If you do not have a developer, use Zapier instead. OptiMonk's 1 April 2026 webhook article is the live reference.

Default POST fields include first name, last name, email, phone, URL, campaign name, campaign ID, coupon (on some templates), GDPR checkbox, dropdown, checkbox, feedback, radio, country, city, zip.

Webhooks cannot delay a send. A multi-step popup with email on page 1 and phone on page 2 will error in the OptiMonk admin (the data can still arrive). Put email and phone on the same page.

Add the webhook on a campaign

1. Log in to OptiMonk.
2. Campaigns → three dots on the campaign → Edit campaign, or open it and Edit settings.

3. Open INTEGRATIONS.

4. Under Where would you like to send the subscribers and campaign data?, click Add new integration.

5. Select Webhook.

6. Name it. Paste your endpoint URL, not a sample. OptiMonk still offers https://www.optimonk.hu/webhook_sample.php as a test page; that is for a dry run, not production. webhook.site is the easier test bin.

7. Map fields. Use the subject name as the identifier; OptiMonk says extra markings are not required. Done, then Next.

Test it

Trigger the campaign that has the webhook, fill the form, then check the endpoint logs. You get one log per campaign page. A coupon on page 3 shows up in the third log.

If nothing arrives: wrong campaign, unpublished GTM tag, endpoint rejecting OptiMonk's IPs, or a typo in the URL.

Can I send OptiMonk data to more than one webhook?

Yes. Add another Webhook integration on the same campaign, or on a different campaign, with a different URL.

What events fire the webhook?

A completed form on that campaign. Exit-intent or other triggers only matter as far as they show the form. There is no delayed send.

Klaviyo and Keap are nicer if they are already your ESP. Webhook is the escape hatch. Related: Klaviyo, BigCommerce, Keap.