Send a message on Mattermost when an order is created in WooCommerce

{
  "id": "188",
  "name": "Send a message on Mattermost when an order is created in WooCommerce",
  "nodes": [
    {
      "name": "WooCommerce Trigger",
      "type": "n8n-nodes-base.wooCommerceTrigger",
      "position": [
        550,
        260
      ],
      "webhookId": "84960a7c-cb69-4dfb-a5ed-aac12e0efbf8",
      "parameters": {
        "event": "order.created"
      },
      "credentials": {
        "wooCommerceApi": "woocommerce"
      },
      "typeVersion": 1
    },
    {
      "name": "Mattermost",
      "type": "n8n-nodes-base.mattermost",
      "position": [
        750,
        260
      ],
      "parameters": {
        "message": "={{$node[\"WooCommerce Trigger\"].json[\"billing\"][\"first_name\"]}} bought {{$node[\"WooCommerce Trigger\"].json[\"line_items\"][0][\"name\"]}}!",
        "channelId": "pj1p95ebei8g3ro5p84kxxuuio",
        "attachments": [],
        "otherOptions": {}
      },
      "credentials": {
        "mattermostApi": "Mattermost Credentials"
      ...