DOOR_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

// KEY.
function decodeData(token) {
  const encoded = token.split('_')[1]
  const json = Buffer.from(encoded, 'base64').toString()
  const data = JSON.parse(json)

  return data   
}

// ✨ hint: use Node.js to open the door. ✨