UniFi stock alerts in Slack.

In Slack: create (or open) an app at api.slack.com/apps, enable Incoming Webhooks, and add one for the channel that should get restock alerts. Copy the webhook URL it gives you.

Create a Cloudflare Worker (free tier is fine) with this code and set two secrets: SLACK_WEBHOOK_URL from step 1 and NOTIFI_TOKEN, a long random string of your choosing.

export default {
  async fetch(request, env) {
    if (request.method !== "POST") return new Response(null, { status: 405 });
    if (request.headers.get("Authorization") !== `Bearer ${env.NOTIFI_TOKEN}`) {
      return new Response(null, { status: 401 });
    }
    const alert = await request.json();
    if (alert.event !== "in_stock") return new Response(null, { status: 200 });

    const price =
      alert.price?.amount != null
        ? ` at $${(alert.price.amount / 100).toFixed(2)}`
        : "";
    await fetch(env.SLACK_WEBHOOK_URL, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({
        text: `:package: *${alert.product.title}* is back in stock${price}\n${alert.product.url}`,
      }),
    });
    return new Response(null, { status: 200 });
  },
};

In NotiFi: Settings, then Webhook. Paste the Worker's URL, set the same bearer token, and hit Test to see the message land. Every restock alert for your watched products now posts to Slack the moment it fires; payload details live in the webhook documentation.