curl --request GET \
  --url https://www.getinboxzero.com/api/v1/group/{groupId}/emails \
  --header 'API-Key: <api-key>'

{
  "messages": [
    {
      "id": "<string>",
      "threadId": "<string>",
      "labelIds": [
        "<string>"
      ],
      "snippet": "<string>",
      "historyId": "<string>",
      "attachments": [
        {}
      ],
      "inline": [
        {}
      ],
      "headers": {},
      "textPlain": "<string>",
      "textHtml": "<string>",
      "matchingGroupItem": {
        "id": "<string>",
        "type": "FROM",
        "value": "<string>"
      }
    }
  ],
  "nextPageToken": "<string>"
}