Track conversions for Meta, Google Ads, and LinkedIn

SMOC Studio Settings — Head Tags and Embed live next to each other

Track conversions for Meta, Google Ads, and LinkedIn

Point paid traffic at a SMOC landing page, then send interaction, qualified, and lead events back to the ad platforms so campaigns can optimize.

This is the same pattern used on SMOC-hosted flows: pixels and callback functions live in Studio → Settings → Head Tags, and each funnel step fires a callback from a Custom HTML element (Studio labels this HTML Script) with an empty image and onerror.

Use this for:

Meta engagement and conversion ads (Facebook / Instagram)
Google Ads, including Performance Max
LinkedIn conversion and conversation ads

Two parts

Head Tags load the Meta Pixel, Google Ads tag, and LinkedIn Insight Tag, then define JavaScript functions such as report_conversion_interaction().
Custom HTML on a conversation node calls those functions when that step is shown.

Conversation HTML is injected into the page. A <script> inside a message is not a reliable place to load pixels. Head Tags run in the document <head> on every visit. The empty-image callback is how a specific step triggers a conversion without waiting for a page reload.

1. Paste pixels and callbacks in Head Tags

In Studio open the web flow → Settings → Head Tags. Paste the platform snippets, then the callback functions. Replace the placeholder IDs with values from Meta Events Manager, Google Ads (Tools → Conversions), and LinkedIn Campaign Manager (Analyze → Conversion tracking).

Include the Google gtag.js loader. Defining gtag() alone queues events; the loader actually sends them.

<!-- Google Ads (required for Performance Max conversion actions) -->
<script async src="https://www.googletagmanager.com/gtag/js?id=AW-XXXXXXXXXX"></script>
<script>
  window.dataLayer = window.dataLayer || [];
  function gtag(){dataLayer.push(arguments);}
  gtag('js', new Date());
  gtag('config', 'AW-XXXXXXXXXX');
</script>

<!-- Meta Pixel -->
<script>
!function(f,b,e,v,n,t,s)
{if(f.fbq)return;n=f.fbq=function(){n.callMethod?
n.callMethod.apply(n,arguments):n.queue.push(arguments)};
if(!f._fbq)f._fbq=n;n.push=n;n.loaded=!0;n.version='2.0';
n.queue=[];t=b.createElement(e);t.async=!0;
t.src=v;s=b.getElementsByTagName(e)[0];
s.parentNode.insertBefore(t,s)}(window, document,'script',
'https://connect.facebook.net/en_US/fbevents.js');
fbq('init', 'YOUR_META_PIXEL_ID');
fbq('track', 'PageView');
</script>
<noscript><img height="1" width="1" style="display:none"
src="https://www.facebook.com/tr?id=YOUR_META_PIXEL_ID&ev=PageView&noscript=1"
/></noscript>

<!-- LinkedIn Insight Tag -->
<script type="text/javascript">
_linkedin_partner_id = "YOUR_LINKEDIN_PARTNER_ID";
window._linkedin_data_partner_ids = window._linkedin_data_partner_ids || [];
window._linkedin_data_partner_ids.push(_linkedin_partner_id);
</script>
<script type="text/javascript">
(function(l) {
if (!l){window.lintrk = function(a,b){window.lintrk.q.push([a,b])};
window.lintrk.q=[]}
var s = document.getElementsByTagName("script")[0];
var b = document.createElement("script");
b.type = "text/javascript";b.async = true;
b.src = "https://snap.licdn.com/li.lms-analytics/insight.min.js";
s.parentNode.insertBefore(b, s);})(window.lintrk);
</script>
<noscript>
<img height="1" width="1" style="display:none;" alt=""
src="https://px.ads.linkedin.com/collect/?pid=YOUR_LINKEDIN_PARTNER_ID&fmt=gif" />
</noscript>

<script>
function report_conversion_interaction() {
  gtag('event', 'conversion', { 'send_to': 'AW-XXXXXXXXXX/INTERACTION_LABEL' });
  fbq('track', 'ViewContent');
  window.lintrk('track', { conversion_id: LINKEDIN_INTERACTION_CONVERSION_ID });
}

function report_conversion_qualified() {
  gtag('event', 'conversion', { 'send_to': 'AW-XXXXXXXXXX/QUALIFIED_LABEL' });
  fbq('track', 'CustomizeProduct');
  window.lintrk('track', { conversion_id: LINKEDIN_QUALIFIED_CONVERSION_ID });
}

function report_conversion_lead_captured() {
  gtag('event', 'conversion', { 'send_to': 'AW-XXXXXXXXXX/LEAD_LABEL' });
  fbq('track', 'Lead');
  window.lintrk('track', { conversion_id: LINKEDIN_LEAD_CONVERSION_ID });
}
</script>

Publish the flow after saving Head Tags.

PageView / tag load fires when someone opens the landing page. Lead and other funnel events must not fire on load — only when the matching Custom HTML node is shown.

2. Fire callbacks from Custom HTML

On the node that represents that funnel step, add a Custom HTML element (picker category Content, field label HTML Script) and paste:

<img src="" onerror="report_conversion_interaction()" style="display:none">

Use the matching function on later nodes:

<img src="" onerror="report_conversion_qualified()" style="display:none">

<img src="" onerror="report_conversion_lead_captured()" style="display:none">

An empty src fails to load, so the browser runs onerror and calls the Head Tags function. You can keep visible copy in the same HTML:

<p>Great — a few questions so we can help.</p>
<img src="" onerror="report_conversion_interaction()" style="display:none">

Typical mapping:

Flow step	Callback	Meta	Google Ads	LinkedIn
Visitor starts talking (first meaningful reply)	`report_conversion_interaction`	`ViewContent`	Interaction conversion	Interaction conversion ID
Qualified (answered your filter questions)	`report_conversion_qualified`	`CustomizeProduct`	Qualified conversion	Qualified conversion ID
Contact captured	`report_conversion_lead_captured`	`Lead`	Lead conversion	Lead conversion ID

Place the lead callback on the thank-you / confirmation node after the form is submitted, not on the form itself.

Meta engagement ads

In Meta Events Manager, confirm the pixel and standard events. In Ads Manager, point the ad to the SMOC Flow URL (https://go.smoc.ai/<company>/<flow>/<variant>) with UTMs.

For engagement campaigns, optimize toward ViewContent (or a custom event you fire from report_conversion_interaction). That event means the visitor actually started the conversation — stronger than a landing-page view.

For lead-gen / conversion campaigns, set Lead as the optimization event and keep ViewContent as an upper-funnel signal. Do not optimize a lead campaign on PageView.

Google Ads and Performance Max

In Google Ads create one conversion action per callback (Tools → Conversions → New conversion action → Website). Use the event snippet send_to value (AW-XXXXXXXXXX/LABEL) in the matching gtag('event', 'conversion', …) call.

Performance Max needs conversion actions to bid. A usual setup:

Primary: lead captured (report_conversion_lead_captured)
Secondary / observation: interaction and qualified, so PMax can learn earlier in the funnel

Set the asset group’s final URL to the SMOC landing page. Append UTMs (utm_source=google, utm_medium=pmax, utm_campaign=…) so Console can attribute the same traffic.

Enhanced conversions and consent mode are configured in Google Ads / gtag — SMOC does not replace that setup. If you already load everything through GTM in Head Tags, you can fire the same events from GTM instead of inline gtag calls; the Custom HTML callbacks still need functions that GTM or dataLayer.push can see.

LinkedIn conversion ads

In Campaign Manager create website conversions (Insight Tag already on the page). Each conversion has a numeric conversion ID. Pass that ID to window.lintrk('track', { conversion_id: … }).

Use those conversions on website conversion or conversation ad objectives. Point the ad to the SMOC Flow URL. Optimize the campaign on the lead conversion; keep the interaction conversion as an early signal, the same way Meta uses ViewContent.

LinkedIn conversion ads are paid LinkedIn ads that send people to the web flow. They are not the same as SMOC LinkedIn message flows (outbound DMs from a connected sender). Message-flow setup is in Connecting to SMOC LinkedIn Agent.

Landing page vs iframe on your site

For ads, the SMOC-hosted landing page is the straightforward destination: Head Tags on that flow are the page the visitor actually loads.

If you embed the flow in an iframe on your own domain, parent-page pixels see the outer page, not conversation steps. Keep Head Tags and Custom HTML callbacks on the flow so conversions still fire when the agent reaches a node. Pass UTMs into the iframe with smoc.js as in that guide.

Check that events fire

Open the published Flow URL (not Studio preview) with each platform’s helper: Meta Pixel Helper, Google Tag Assistant / Ads conversion diagnostics, LinkedIn Insight Tag helper.
Confirm PageView / tag load on first paint.
Walk the conversation until the Custom HTML node. The helper should show ViewContent / conversion / lintrk track — not before.
In each ads UI, wait for the conversion action to move from no recent conversions to recording test events (can take a few hours).