{
  bulkCallbackV2: function(treatments) {
    if (!window.amplitude || !treatments || !treatments.length) return;

    treatments.forEach(function(t) {
      window.amplitude.track("coframe_treatment_applied", {
        cf_user_token: t.coframe_user_token,
        cf_variant_id: t.coframe_variant_id,
        cf_variant_slug: t.coframe_variant_slug,
        cf_experiment_id: t.coframe_experiment_id,
        cf_experiment_slug: t.coframe_experiment_slug,
        cf_impression_id: t.coframe_impression_id,
        cf_is_global_holdout: String(t.coframe_in_global_holdout),
        cf_is_baseline: String(t.coframe_in_exp_baseline),
      });
    });
  }
}

{
  bulkCallbackV2: function(treatments) {
    if (!window.amplitude || !treatments || !treatments.length) return;

    var identifyEvent = new window.amplitude.Identify();
    treatments.forEach(function(t) {
      if (t.coframe_experiment_slug) {
        identifyEvent.set(
          "cf_" + t.coframe_experiment_slug,
          t.coframe_variant_slug
        );
      }
    });
    window.amplitude.identify(identifyEvent);
  }
}

# Amplitude

Send Coframe treatment events to Amplitude using a bulkCallbackV2 snippet.

Coframe can send treatment data to Amplitude in two ways: as a track event (useful for funnel and chart analysis) or as user properties via an identify call (useful for cohort segmentation). Use whichever variant — or both — fits your Amplitude workflow.

## Variant 1: Event tracking

Add this `bulkCallbackV2` to log a `coframe_treatment_applied` event for every treatment a visitor receives.


JS



```
{
  bulkCallbackV2: function(treatments) {
    if (!window.amplitude || !treatments || !treatments.length) return;

    treatments.forEach(function(t) {
      window.amplitude.track("coframe_treatment_applied", {
        cf_user_token: t.coframe_user_token,
        cf_variant_id: t.coframe_variant_id,
        cf_variant_slug: t.coframe_variant_slug,
        cf_experiment_id: t.coframe_experiment_id,
        cf_experiment_slug: t.coframe_experiment_slug,
        cf_impression_id: t.coframe_impression_id,
        cf_is_global_holdout: String(t.coframe_in_global_holdout),
        cf_is_baseline: String(t.coframe_in_exp_baseline),
      });
    });
  }
}
```

## Variant 2: User properties (identify)

Add this `bulkCallbackV2` to tag the user profile with each experiment’s assigned variant slug, enabling cohort-based analysis.


JS



```
{
  bulkCallbackV2: function(treatments) {
    if (!window.amplitude || !treatments || !treatments.length) return;

    var identifyEvent = new window.amplitude.Identify();
    treatments.forEach(function(t) {
      if (t.coframe_experiment_slug) {
        identifyEvent.set(
          "cf_" + t.coframe_experiment_slug,
          t.coframe_variant_slug
        );
      }
    });
    window.amplitude.identify(identifyEvent);
  }
}
```

## Where to place it

Place either (or both) snippets inside your Coframe analytics callback as described in [Tracking Settings](../docs/tracking-settings.html).

## What gets sent

Each call passes the `coframe_*` fields from the treatment object. These fields are described in [Experiment Assignment & IDs](../docs/experiment-assignment.html).