curl --request POST \
  --url https://{operatorDomain}/v1/admin/trips/{envelopeId}/reserve \
  --header 'Authorization: Bearer <token>'

{
  "data": {
    "envelopeId": "trip_01J9",
    "status": "draft",
    "currency": "EUR",
    "components": [
      {}
    ]
  }
}