curl --request GET \
  --url https://inbound.new/api/e2/onboarding/check-reply \
  --header 'Authorization: Bearer <token>'

{
  "hasReply": true,
  "reply": {
    "from": "<string>",
    "subject": "<string>",
    "body": "<string>",
    "receivedAt": "<string>"
  }
}