curl --request DELETE \
  --url https://api.railmail.app/api/v1/segments/{segmentId}/members \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "subscriberIds": [
    "3c90c3cc-0d44-4b50-8888-8dd25736052a"
  ]
}
'

{
  "type": "<string>",
  "title": "<string>",
  "status": 123,
  "detail": "<string>",
  "instance": "<string>",
  "timestamp": "2023-11-07T05:31:56Z",
  "errors": {}
}