GitHub Start free

What does the RevenueDot webhook event EXPERIMENT_ENROLLMENT mean?

The RevenueDot webhook event EXPERIMENT_ENROLLMENT means a customer joined an offering experiment.

Quick facts#
Event EXPERIMENT_ENROLLMENT
Where RevenueDot webhook (event.type), RevenueCat's webhook format
Sent to Every enabled webhook whose filters match
Fields that are specific to it experiment_id, experiment_variant, offering_id, experiment_enrolled_at_ms
What it means A customer joined an offering experiment: the first offerings request that enrolled them. Sent once per customer and experiment, as a production event with no app.

When it is sent#

  • The first offerings request of a customer that matches an experiment's targeting enrolls them in a variant.
  • It is sent once per customer and experiment.
  • It is a production event with no app, so a webhook set to sandbox only, or to one app, does not get it.

What your server should do#

  1. Store the experiment_id and experiment_variant (a is the control) against the customer so your analytics can split results.
  2. Do not use it to grant anything.
  3. Use a webhook set to production and all apps if you need it.
  4. Deduplicate on event.id: deliveries can repeat, because anything but HTTP 200 is retried after 5, 10, 20, 40 and 80 minutes.

Example#

JavaScript
import { createHmac, timingSafeEqual } from "node:crypto";

// X-RevenueCat-Webhook-Signature: t=<unix seconds>,v1=<hex HMAC-SHA256 of "<t>.<raw body>">
function verify(rawBody, header, secret, toleranceSeconds = 300) {
  const m = /^t=(\d+),v1=([0-9a-f]{64})$/.exec(header ?? "");
  if (!m || Math.abs(Date.now() / 1000 - Number(m[1])) > toleranceSeconds) return false;
  const expected = createHmac("sha256", secret).update(`${m[1]}.${rawBody}`).digest();
  return timingSafeEqual(expected, Buffer.from(m[2], "hex"));
}

// Sign a sample delivery the way RevenueDot does, then handle it.
const secret = "whsec_test_secret";
const rawBody = JSON.stringify({ api_version: "1.0", event: {"id":"66339910-3BFF-49F4-B873-D1283D673DE2","type":"EXPERIMENT_ENROLLMENT","app_user_id":"user_1","product_id":"pro_monthly","experiment_id":"exp_1","experiment_variant":"b"} });
const t = Math.floor(Date.now() / 1000);
const header = `t=${t},v1=${createHmac("sha256", secret).update(`${t}.${rawBody}`).digest("hex")}`;

const seen = new Set(); // use a database table in production

function handle(rawBody, header) {
  if (!verify(rawBody, header, secret)) return "401 bad signature";
  const { event } = JSON.parse(rawBody);
  if (seen.has(event.id)) return "200 duplicate";
  seen.add(event.id);
  if (event.type !== "EXPERIMENT_ENROLLMENT") return "200 ignored";
  return "record " + event.app_user_id + " in " + event.experiment_id + " variant " + event.experiment_variant;
}

console.log(handle(rawBody, header));

Run-checked: npm run check:snippets runs this snippet with Node and compares its output with variant b (checked 2026-10-03).

How RevenueDot produces it#

services/targeting.ts records it with recordRawEvent in the experiment shape (no app_id, no subscriber attributes) the first time a customer is enrolled.

Source#

Checked: 2026-10-03

Edit this page on GitHub ↗ View as Markdown Last updated