curl --request GET \
  --url https://app.herondata.io/api/merchants/search \
  --header 'x-api-key: <api-key>'

{
  "merchants": [
    {
      "name": "<string>",
      "url": "<string>",
      "categories": [
        {
          "code": "7311",
          "description": "Advertising services",
          "slug": "advertising_services"
        }
      ],
      "group_id": "Uber",
      "heron_id": "mrc_MQ6m783Jf7Ewj7nk5KyJYy",
      "icon_url": "<string>",
      "is_priority": true,
      "logo_url": "<string>"
    }
  ]
}